Natural Selection 2 is a game with a pretty fair learning curve in it, which is difficult enough to pick up on without the confusion of terminology and acronyms and abbreviations to top it off. The purpose of this guide is to familiarize yourself with some of the things you'll be hearing or reading out on the battlefield. If I've missed anything, defined something incorrectly, or you want me to add something, comment down below and I'll do so.

I've pooled these terms from my own play, the NS2 Wiki Page[www.unknownworlds.com], a forum thread[www.unknownworlds.com], and all the awesome people who commented on the guide with additions.

This guide has been translated into Chinese (simplified) by Axamdeep of http://onos.cc/. You can find this version here[onos.cc].

LMG - Light Machine Gun (the Marine standard issue rifle, leftover term from NS1)
SG - Shotgun
Shotty - Shotgun
FT - Flamethrower
Flamer - Flamethrower
GL - Grenade Launcher
JP - Jet Pack
Jetty - Jet Pack
Exo - Exosuit
Dual (Exo) - Dual Minigun Exosuit

RT - Resource Tower, term left over from NS1 that means either Marine Extractor or Alien Harvester
IP - Infantry Portal (Where you spawn)
Obs - Observatory
Phase - Phase Gate
PG - Phase Gate
Proto - Prototype Lab
CC - Command Station
Chair - Command Station
Robo - Robotics Facility
"Base" - Usually refers to first spawn.

Ping - Scan with an Observatory. "Ping Data Core"
Phase - Use the Phase gates to travel somewhere. "Phase to Cafeteria"
Beacon - Use the Observatory's ability to teleport all marines to the Command Station nearest to the observatory activated. "Beacon us to base."
Recyc/Cycle/Sell - Recycle a building, either because it isn't needed or is about to be destroyed.
Siege - The use of ARCs to take down alien bases from afar.
Socket - To socket a power node in an area.

Rine - Marine
Arc Train - a group or line of ARCs moving up to the front to be deployed. Sometimes seen with MACs accompanying them.
Exo Train - a group or line of Exos moving up to the front. Sometimes also seen with MACs.
"Feed" Gate - Term for a phase gate that is being destroyed by so many aliens, it becomes a meat grinder.

Kharaa - Alien team's formal name.

RT - Resource Tower, term left over from NS1 that means either Marine Extractor or Alien Harvester
Butthole - Gorge Tunnel entrances

Bile - Bile Bomb
BB - Bile Bomb
Heal - Use gorge's ability to heal-spray.
Gorge up/Clog up an area - Use the gorge's clogs and hydras to reinforce/seal off an entrance to an area.
Rush - Attack a position quickly. Usually used in conjunction with a lifeform name. E.g. Skulk rush, Gorge rush, or the dreaded Onos rush.
Enzyme - Drifter active ability where the commander can make an enzyme cloud, speeding up attacks.

Regen - Regeneration Trait
"Celery" - Celerity Trait
Cara - Carapace Trait
Invis - Camouflage Evolution
Cloak - Camouflage
Camo - Also camouflage
Adren - Adrenaline Trait

Egg Lock - Too few eggs to spawn quickly, generally caused by a failed rush, too many people dieing too often, or else it's marines in your base shooting eggs.
Upgrades - (as in "Killing our Upgrades") The upgrade structures that allow the aliens to have specific evolutions.
"Forward Base"/Crag Nest - A cluster of crags, whips, shades, and/or shifts generally just outside enemy base that aliens can heal at.
Gorge Nest - Rare natural phenomenon where one or more gorges will join together to build a structure of clogs and hydras, sometimes in extraordinary locations.
Bugs - Babblers

comm - Commander
res - Resources
tres - Team Resources
GG - Good Game
Spawn - Generally refers to first spawn area, not just where you respawn.
Concede - Hold "x" and vote concede.
F4 - The act of pressing F4 to return to the Ready Room and thus end the game.
Eject - Hold "x" and vote to eject the commander
Double - Term used to describe a room with two resource nodes in it. (Currently Nanogrid, Central Drilling on official maps)
dres - Another term for double resource node rooms.
RR - Ready Room

Push <place> - Apply pressure to an area by repeatedly advancing on it in force. Usually with the intention of either taking the area or at least forcing the enemy to defend it. "Push Repair room"
Drop <place>/<building> - The action of a commander placing buildings down. Most often used to tell the commander to set up an extractor somewhere. "Drop Computer lab" (In reference to the resource node)
ninja - To do something sneakily and generally on ones own. (Ninja gorge biles down power, Ninja Phase gate goes up behind alien lines, Lone marine ninjas some upgrade structures, etc.)
Rush - Usually a term to describe getting a certain upgrade faster than usual so as to throw the enemy team off guard. Common examples include arc rushing, jetpack rushing, camo rushing.
Kite/Kiting - Dodging attacks repeatedly. A jetpacker marine and successfully kite an Onos in a large room with a high ceiling by continuously staying out of range of said Onos.
Overcommit - Usually used in reference to a team moving too far into enemy territory without proper support. A lone Onos running into a marine base full of marines, a fade intent on killing a marine that is successfully kiting him, a lone Exo moving into an alien base, etc. Overcommitting generally ends in death.