Dictionary definition · back
noun
- the posterior part of a human (or animal) body from the neck to the end of the spine"his back was nicely tanned"
- the side that goes last or is not normally seen"he wrote the date on the back of the photograph"
- the part of something that is furthest from the normal viewer"he stood at the back of the stage"
verb
- be behind; approve of"He plumped for the Labor Party"
- travel backward"back into the driveway"
- give support or one's approval to"I'll second that motion"
adjective
- related to or located at the back"the back yard"
- located at or near the back of an animal"back (or hind) legs"
- of an earlier date"back issues of the magazine"
adverb
- in or to or toward a former location"she went back to her parents' house"
- at or to or toward the back or rear"he moved back"
- in or to or toward an original condition"he went back to sleep"
Source: Open English WordNet (CC BY 4.0).