名詞 decrement:

1. the amount by which something decreases
   同義詞：decrease
2. a process of becoming smaller or shorter
   同義詞：decrease

dec.re.ment

n.（名詞）
The act or process of decreasing or becoming gradually less.
減少：縮減或減少的過程或逐漸減少
The amount lost by gradual diminution or waste.
消耗量：逐漸損耗或浪費(fèi)而失去的量
Mathematics The amount by which a variable is decreased; a negative increment.
【數(shù)學(xué)】 減量：可變量減少的數(shù)量；負(fù)增長

來源：
Latin dôcrômentum
拉丁語 dôcrômentum
from dôcrôscere [to decrease] * see decrease
源自 dôcrôscere [減少，減小] *參見 decrease

【引伸】
dec.rement.al