Definition of "Apply" :
verb: ask (for something)
"Apply for a job."
verb: refer (a word or name) to a person or thing
verb: put into service; make work or employ for a particular purpose or for its inherent or natural purpose
"Apply a magnetic field here."
verb: apply to a surface
verb: give or convey physically
verb: ensure observance of laws and rules
"Apply the rules to everyone."
verb: avail oneself to
"Apply a principle."
verb: apply oneself to
"Please apply yourself to your homework."
verb: be pertinent or relevant or applicable
"The same laws apply to you!."
verb: be applicable to; as to an analysis