amplification (n.) Look up amplification at Dictionary.com
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) + stem of facere "to make, do" (see factitious). Originally in English often of rhetorical devices; meaning "enlargement of sound by electrical technology" is from 1915.