Whereby definition is associated with terms, or distinctions are made between similar terms.
- The Quake 3 engine as created by Id Software, Inc. This is the part of the program contained within the platform-specific binaries that (so far) are distributed without source text. Also known as "the EXE" in Windows.
- "Quake III: Arena", the first game created by Id Software designed to run on the Quake 3 engine. I make the distinction where "Q3" refers to the engine itself, and "Q3A" refers to the game(play). Mostly synonymous with "baseq3".
- "Quake III: Team Arena", the second game created by Id Software designed to run on the Quake 3 engine. The source code to Q3TA is also packaged in baseq3, but (de)activated with compiler conditionals. Artwork (models, skins, maps, textures) are packaged separately (as a product) and for the most part is considered an entirely different product from Q3A.
- Refers primarily to the distributed source code for modifications on Q3, the source code corresponding to Q3A. Also used to refer to Q3A as a special case in the context of mods (the mod from which most others are derived, or "the original mod").