English
amplifiable
From amplify + -able.
A compound of amplify + -able
Latin amplus ‘abundant, ample’
Latin amplificāre
Old French amplifier
Middle English amplifiyen ‘to amplify, embiggen, or heighten’
English amplify
Today it means
adj Capable of being amplified.
Language periods are conventional ranges, not dates for this word.
Etymograph / amplifiable