noun
ritardando
Musical term indicating a gradual slowing of tempo.
from Italian
この楽譜にはリタルダンドの指示が書いてある。
This score has a ritardando marking.
Accelerando: a gradual increase in tempo, opposite of ritardando.
Ritenuto: a more immediate slowing down, often for a short passage, while ritardando is a gradual slowing.
Borrowed from Italian 'ritardando', the gerund of 'ritardare' (to slow down).