amplification (n.)

1540s, "enlargement" in any dimension, from Latin amplificationem (nominative amplificatio) "a widening, extending," noun of action from past participle stem of amplificare "to enlarge, broaden, increase," from amplus "large" (see ample) + combining form of facere "to make, do" (from PIE root *dhe- "to set, put"). Originally in English often of rhetorical devices; meaning "enlargement of sound by electrical technology" is from 1915.