— infinitesimality, infinitesimalness , n. — infinitesimally , adv.
/in'fin i tes"euh meuhl/ , adj.
1. indefinitely or exceedingly small; minute: infinitesimal vessels in the circulatory system.
2. immeasurably small; less than an assignable quantity: to an infinitesimal degree.
3. of, pertaining to, or involving infinitesimals.
n.
4. an infinitesimal quantity.
5. Math. a variable having zero as a limit.
[ 1645-55; infinitesim ( us ), equiv. to L infinit ( us ) INFINITE + -esimus suffix of ordinal numerals + -AL 1 ]