Definition of amplifiers:
(n) :
(electronics) An appliance or circuit that increases the strength of a weak electrical signal without changing the other characteristics of the signal.
(n) :
Anything that amplifies, or makes something larger or more intense.
(n) :
(music) A portable encasement that houses a large speaker, used to amplify voices and musical instruments at live performances.
(n) :
(linguistics) An adverb that adds intensity, such as "really" or "totally".
(n) :
A lens that enlarges the field of vision.