The act of employing anything, or of applying it to one's service; the state of being so employed or applied; application; employment; conversion to some purpose; as, the use of a pen in writing; his machines are in general use.(noun)
source: webster1913
verb (v)
put into service; make work or employ for a particular purpose or for its inherent or natural purpose(verb.consumption)
Example: Use your head!.
We only use Spanish at home.
I can't use this tool.
Use the plastic bags to store the food.
He doesn't know how to use a computer.
habitually do something (use only in the past tense)(verb.social)
Example: She used to call her mother every week but now she calls only occasionally.
I used to get sick when I ate in that dining hall.
They used to vacation in the Bahamas.
source: wordnet30
To make use of; to convert to one's service; to avail one's self of; to employ; to put a purpose; as, to use a plow; to use a chair; to use time; to use flour for food; to use water for irrigation.(verb)
source: webster1913
To be wont or accustomed; to be in the habit or practice; as, he used to ride daily; -- now disused in the present tense, perhaps because of the similarity in sound, between "use to," and "used to."(verb)