am ‧ pli ‧ tude /ˈæmplətjuːd, ˈæmplɪtjuːd $ -tuːd/ BrE AmE noun [uncountable]
[ Date: 1500-1600 ; Language: French ; Origin: Latin amplitudo , from amplus ; ⇨ ↑ ample ]
technical the distance between the middle and the top or bottom of a ↑ wave such as a ↑ sound wave