A- 
ADAPTER:
Used to allow a specific style of atomizer or cartomizer to fit onto a different style of battery. Many users prefer the vapor production of one style of attle but prefer the battery life or anthoer style of battery. This allows them to have access to to both.
 
ALL DAY VAPE
An all day vape is an e-liquid or flavor that you can depend on no matter what. You can vape on it because it'll never get old.
 
ATOMIZER TANK
The atomizer tank is your most commonly used style of tank that uses a single or dual-coil.
 
AIRFLOW (adjustable airflow): 
This is a part on most vaping tanks; clearomizers, atomizers, etc; that allows more air to be received in the process of vaping, allowing for more vapor, as well as cooler vape
 
B- 
BATTERY:
The battery is what provides power to the atomizer when the user inhales on the mouthpiece. It is general lithium-ion, ranges in size and has an LED light that glows when used.
 
BRIDGE:
Sits inside of an atomizer and secures the cartridge above the coil. It also helps the liquid flow through the wick of the coil.
 
C- 
CARTRIDGE:
A plastic tube that is generally stuffed with some type of absorbent filler material that holds the liquid.
 
CARTOMIZER:
A cartridge and atomizer in one. They generally are disposable, fairly inexpensive & pre-filled with juice.
 
CHARGER:
A battery charger; Used to recharge your e-cig battery.
 
CLEAROMIZER:
A clear tank storage and atomizer in one. They are refillable and supply liquid to the coil through a wick stystem. 
 
CLONE:
A knock-off of an E-cig. Generally clones only exist for the more expensive e-cigs.
 
COIL:
The part of an atomizer that heats the e-liquid.
 
CLOUD CHASING
Vapers who try to blow the biggest cloud possible.
 
COIL JIG: 
A device that makes rebuilding your own coils so much simpler.
 
D- 
DRIP TIP:
The very top piece that is attached to your tank that you put your mouth on.
 
DRIPPING:
A method of adding juice to an atomizer. Many users feel this method produces the best vapor production and taste.
 
DIY:
Do it yourself. This became established as the term for home improvements by the homeowner, and in the vaping world it refers to any self-made item or modification as against a store-bought solution. The most common areas of DIY are refill liquid, RBA builds, and storage solutions (stands and boxes and the like).
 
E- 
E-Juice:
Also called E-Juice. This is the liquid that is vaporized when using an electronic cigarette.
 
eGo:
A style of electronic cigarette that utilizes the 510 threads, 510 componets  and has a larger battery. Many people feel thus is one of the best and easiest models of e-cigs that are available. 
 
F- 
FDA:
Abbreviation for the United States Food & Drug Administration
 
Flooding:
Something that can occur when too much juice is applied to the atomizer. Since atomizers requires some air properly vaporize liquid, adding to much juice to an atomizer will cause a decrease in vapor production. 
H- 
Hookah Pen: 
Another form of vaping, usually a disposable cig similar to the e-cig which may or may not contain nicotine.
 
Hybrid: 
A type of APV, normally a mech mod with integrated battery tube, reservoir tank and RBA. Examples: some GG models, some Zen models. The device is commonly a stainless tube mod with a genesis or RTA (i.e. a tank + RBA) made to fit exactly, so that it has the same diameter, construction and styling as the battery tube; usually the actuator is a bottom button.

J- 
Juice:
Also referred to as E-liquid, E-Juice. This is the liquid that is used when using a e-cig.
 
L- 
Leaking:
This can happen when to much liquid is added to an atomizer or cartomizer. Liquid can leak out of the bottom of the heating element and onto the battery, which is some cases can cause damage to the device. 
 
Low Resistance:
An atomizer or cartomizer with a lower Ohm rating than the standard equipment. This generally causes the heating element to get hotter faster and produces vapor more quickly. 
 

M- 
Mech:
Mod Or Mechanical Mod: These are devices with no electrical components, these are are more advanced personal vaporizers. 
 
Mesh:
Wire- Often stainless steel and used to create a wick for brining e-juice to the coils of an atomizer.
 
Mod: 
Dual usage – Can be used to describe modifications to a device or accessory (such as getting more vapor production out of your cartridges) or a design variation of a commonly manufactured electronic cigarette. In the latter context, mods typically use larger rechargeable Lithium Ion batteries and allow the user longer battery life and increased vapor production but at the cost of the device looking like a traditional cigarette. Many mods will also allow the user to increase or decrease the voltage of their device to achieve optimal performance.
 
MAH:
Milliampere hours, a measure of a battery's capacity in terms of its output in milliamps by time. 1,000 milliamps = 1 amp. For example a 1,600 mAh battery is rated to deliver 1.6 amps for an hour. This figure has no relation to the burst (or 'pulse') power output, which can be 10, 20 or 30 amps for a battery rated around 1,600 mAh.

O- 
Ohm:
A measure of electrical resistance. A lower number indicates lower resistance and faster heating. 
 
O-Ring:
A circular seal usually made from silicone, nitrile or other synthetic rubber-like materials. O-rings are widely used in ecigs to provide a sliding fit with a good liquid and gas seal, especially in larger or custom models. Almost all drip tips employ one (or two, in some cases).
 
Organic Cotton Coils: 
A new coil setup made by Kangertech. It features a larger heating section, with the addition of the Japanese organic cotton that lasts longer than the majority of other, cheaper cotton coils.
 
P- 
Passthrough:
A device that plugs directly into the USB port of a computer or charger and allows the user to vape without having to worry about battery life. 
 
Pen Style:
One of many styles of E-cigs, Slightly resembles a ball point pen in appearance. 
 
Propylene Glycol or PG: 
An ingredient found in many brands of E-Juice that produces a vapor that can be inhaled. Typically, PG produces less vapor than it’s VG counterpart but provides more flavor and throat hit. This substance has been used as a primary ingredient in medical inhalers for years.

R- 
RBA:
Rebuildable Atomizer
 
RDA:
Rebuildable Drip Atomizer
 
S- 
Starter Kit: 
A kit that includes basic e-cigarette equipment. Typically includes everything needed to begin vaping. Most starter kits come with 1 or more atomizers, 1 or more batteries, a charger and 5 cartridges pre-filled with Juice.
 
Sub-ohm:
Sub-ohm vaping is the use of an RBA (qv) with an atomiser coil (or multi-coil group) of a resistance measuring below 1 ohm. These devices can produce a phenomenal amount of vapour, although it tends to be hotter and drier than with other devices.
  There is an elevation of risk. This is because the atomiser coil/s become much hotter, since amp draw is elevated and tens of watts of power are used. More heat means that the vapourisation characteristics of the refill liquid are different, and the aerosol generated is likely to have a different chemical profile. There is a real possibility that toxic compounds are present in measurable quantity; refill liquid consumption rises by double or treble over regular head usage; and the combination of increased refill consumption, huge volumes of vapour, hotter atomisers and hotter vapour means that any contaminant or pyrolytic compound will be seen in greater quantity than with other types of head or consumption style. With daily consumption rates of 20ml (more than 4 times the average) and 80 watts of power use being reported by some sub-ohmers, this mode of vaping is rather different from the norm.
  Sub-ohm cloud-chasers are becoming greater in number; some wonder if that is altogether a good thing. On the other hand it has created a massive revitalisation of the mechmod market, a product area that had almost been killed off by VV and VW.
 
Steeping: 
Allowing your e liquid to sit either open to the air, or in a sealed container. This is generally not necessary in e-liquid that has a high ratio of PG to VG. It is more often necessary in  high VG ratio juices.
 
T- 
Tanks:
A Plastic or glass storage chamber that holds the liquid.
 
Throat Hit:
The feeling that one gets in the back of the throat when vaping juice that contains nicotine. Without nicotine there will be no throat hit. 
 
V- 
Vape or Vaping: 
The action of “smoking” an electronic cigarette. Since e-cigs actually produce vapor (rather than smoke) people refer to this as “Vaping”.
 
Vapor Production:
Typically associated with Juices. Indicates how much vapor is produced using an average inhale of an e-cigarette.
 
Vaper(s):
A person or group of people who vape.
 
Variable Voltage or VV:
A dial on a battery that allows you to change the variable heat at the atomizer coil. When changing the voltage, there are acceptable ranges for the resistance measured in Ohms. You have to manually adjust your clearo, cart, and/or atomizer to get the right voltage.
 
Variable Wattage or VW:
A dial on a battery that allows you to change the wattage or power. The PV will then automatically adjust the voltage for the resistance.
 
Vegetable Glycerol or Vegetable Glycerin or VG:
An ingredient found in many brands of E-Juice. This is one of the ingredients used that when heated will produce vapor that can be inhaled. Typically, VG produces more vapor than it’s PG counterpart but provides less flavor and throat hit. Some users who are allergic to Propylene Glycol use 100% VG juices.
 
Vaper’s Tongue: 
This is a common problem among many vapers when they vape too much of one flavor, and their taste buds become desensitized to the flavor. 
 
W- 
Watt:
A unit of power measured as one Joule per second.
 
Wick:
A narrow piece of poly string that is inside many styles of atomizers that allows easier delivery of juice to the heating element.

#- 
510:
This refers to an e-cigarette with a particular componentry size. The 510 was originally developed by Chinese company JoyE and then widely emulated; becoming a standard of sorts in the industry.
 
18650:
A classification given to a specific size of Li-Ion battery popularly used in APVs, mechanical mods, and tube mods.
 
26650: 
These are batteries that have typically been known for good sub-ohming. This is typically seen as true because the 26650 batteries more likely have a larger cathode/anode surface area,  so they will be a bit less susceptible to thermal runaway. However, this is not always a indicator for a great sub-ohm battery.