the act of leaving out the sound of part of a word when you are pronouncing it, as in we’ll, don’t and let’ssee alsoelideSee related entries:PhoneticsWord Originlate 16th cent.: from late Latin elisio(n-), from Latin elidere ‘crush out’, from e- (variant of ex-) ‘out’ + laedere ‘to dash’.
See elision in the Oxford Advanced American Dictionary