infinitesimal

名词 infinitesimal:

1. (mathematics) a variable that has zero as its limit

形容词 infinitesimal:

1. infinitely or immeasurably small
   同义词：minute, microscopic

1. Being neither infinite nor infinitesimal.
   非极限的，非无限小的既非无穷大也非无限小

in.fin.i.tes.i.mal

adj.（形容词）
Immeasurably or incalculably minute.
极微小的，微不足道的
Mathematics Capable of having values approaching zero as a limit.
【数学】 近零的，极小的：无穷小地接近于零的
n.（名词）
An immeasurably or incalculably minute amount or quantity.
无穷小的数量：非常小，几乎无法测量的数量
Mathematics A function or variable continuously approaching zero as a limit.
【数学】 近零：一个接近于零的函数或者变量

来源：
From New Latin onfonotôsimus [infinite in rank]
源自 现代拉丁语 onfonotôsimus [在等级上无穷尽]
from Latin onfonotus [infinite] * see infinite
源自 拉丁语 onfonotus [无穷大的] *参见 infinite

【引伸】
in.finites.imally
adv.（副词）