apply Definition

apply
verb applies, applied, applying

intr
1. To make a formal request, proposal or submission, eg for a job.

Thesaurus: request, demand, beg, appeal, petition.
2. To put something on to something else.

Thesaurus: attach, place on, place upon, put on, put upon, affix, fasten, join, adjoin.
3. To put or spread something on a surface.

Example: applied three coats of paint
intr
4. To be relevant or suitable.

Example: thinks the rules don't apply to her
5. To put (a skill, rule, theory, etc) to practical use.

Example: Try to understand the principles before applying the theory

Etymology: 14c: from Latin applicare to attach.

Phrasal Verb: apply oneself to something

To give one's full attention or energy to (a task, etc).