Source : Webster's Revised Unabridged Dictionary (1913)

Life-size \Life"-size`\ (-s[imac]z`), a.
   Of full size; of the natural size.

Source : WordNet®

life-size
     adj : being of the same size as an original; "a life-size
           sculpture" [syn: {lifesize}, {life-sized}, {full-size}]