am·pli·fy 
(ămplə-fī′)
(ămplə-fī′)v. am·pli·fied, am·pli·fy·ing, am·pli·fies
v.tr.
1. To make larger or more powerful; increase.
2. To add to, as by illustrations; make complete.
3. To exaggerate.
4. To produce amplification of: amplify an electrical signal.
v.intr.
To write or discourse at length; expatiate: Let me amplify so that you will understand the overall problem.
[Middle English amplifien, from Old French amplifier, from Latin amplificāre : amplus, large + -ficāre, -fy.]