1
: ready for use : capable of being used
The factory must pass inspection before it becomes operative.
The telephone system is now fully operative.
2
: most important
If I go, I will bring a salad. "If," however, is the operative word, since I am not sure that I can go.
plural operatives
1
chiefly US
: a person who does secret work for a government or political organization
political operatives [=spies]
CIA/FBI operatives [=agents]
2
: a person who does work that involves using tools, operating machinery, etc.
factory operatives
a skilled operative



