To increase the volume of sound, especially using an amplifier. The band used speakers to amplify the music for the large audience.
To make something more intense or stronger. The scientist aimed to amplify the signal to ensure accurate readings.
To expand or elaborate on a statement or idea. The professor asked the student to amplify his argument with more evidence.
Biology: to make multiple copies of (a gene or DNA sequence). The lab used PCR to amplify the DNA sample.