I. (ˌ)ä-ˌche-lə-ˈrän-(ˌ)dō; ik-ˌse-, (ˌ)ak- adverb or adjective
Etymology: Italian, literally, accelerating, from Latin accelerandum, gerund of accelerare
Date: circa 1842
: gradually faster — used as a direction in music
II. noun
( plural -dos )
Date: 1889
: a gradual increase in tempo