The Collaborative International Dictionary
Amplificatory
Amplificatory \Am*plif"i*ca*to*ry\, a.
Serving to amplify or enlarge; amplificative.
--Morell.
Wiktionary
amplificatory
a. Serving to amplify or enlarge; amplificative.
Usage examples of "amplificatory".
Too, the amplificatory masks, sometimes used in the larger of the tiered theaters, somewhat distorted the sound.