Etymology
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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.

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Definitions of amplification

amplification (n.)
addition of extra material or illustration or clarifying detail;
a few remarks added in amplification and defense
Synonyms: elaboration
amplification (n.)
the amount of increase in signal power or voltage or current expressed as the ratio of output to input;
Synonyms: gain
amplification (n.)
(electronics) the act of increasing voltage or power or current;
From wordnet.princeton.edu