what does unitDefID mean?

[yanom]

I see the word unitDefID alot on Lua call-in's and call-out's, often in the same context as unitID and teamID

[knorke]

every unit has a unitID, a unique number for each unit.
every unittype has a unitDefID, it is also a number and unique to that unittype

[FLOZi]

The same dichotomy applies to weapons;

A type or class of weapon, (or a weapon definition; hence weaponDefID) vs. an individual instance of that weapon on an individual unit.

[zwzsg]

Lassie is a unitID
Dog is a unitDefID