Definitions
1.verbTo fit (a lock) with a key.
2.verbTo fit (pieces of a mechanical assembly) with a key to maintain the orientation between them.
3.verbTo mark or indicate with a symbol indicating membership in a class.
4.verb(telegraphy and radio telegraphy) To depress (a telegraph key).
5.verbTo operate (the transmitter switch of a two-way radio).
6.verb(more usually to key in) To enter (information) by typing on a keyboard or keypad."Our instructor told us to key in our user IDs."
7.verbTo vandalize (a car, etc.) by scratching with an implement such as a key."He keyed the car that had taken his parking spot."
8.verbTo link (as one might do with a key or legend).
9.verbTo be identified as a certain taxon when using a key.
10.verbTo modify (an advertisement) so as to target a particular group or demographic.
11.verbTo attune to; to set at; to pitch.
12.verbTo fasten or secure firmly; to fasten or tighten with keys or wedges.