1. To apply oneself to.
2. To ask (for something).
3. To be pertinent or relevant or applicable; SYN. hold, go for.
4. To refer (a word or name) to a person or thing.

1. To hire for work; to take into one's employment.
2. To use; to implement.

1. To compel or impose; SYN. impose.
2. To ensure observance of laws and rules; SYN. implement, apply.

Alternate (chiefly British) spelling for practice.