Infinitesimal

[in-fin-i-tes-uh-muh l] /ˌɪn fɪn ɪˈtɛs ə məl/

adjective
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, relating to, or involving infinitesimals.
noun
4.
an infinitesimal quantity.
5.
Mathematics. a variable having zero as a limit.
/ˌɪnfɪnɪˈtɛsɪməl/
adjective
1.
infinitely or immeasurably small
2.
(maths) of, relating to, or involving a small change in the value of a variable that approaches zero as a limit
noun
3.
(maths) an infinitesimal quantity
adj.

1710 (1650s as a noun), “infinitely small,” from Modern Latin infinitesimus, from Latin infinitus “infinite” (see infinite) + -esimus, as in centesimus “hundredth.” Related: Infinitesimally.
infinitesimal
(ĭn’fĭn-ĭ-těs’ə-məl)
Adjective Capable of having values approaching zero as a limit.

Noun A function or variable continuously approaching zero as a limit.

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Infinitesimal-calculus
noun 1. the differential calculus and the integral calculus, considered together. noun 1. another name for calculus (sense 1)
Infinitesimally
[in-fin-i-tes-uh-muh l] /ˌɪn fɪn ɪˈtɛs ə məl/ adjective 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, relating to, or involving infinitesimals. noun 4. an infinitesimal quantity. 5. Mathematics. a variable having zero as a limit. /ˌɪnfɪnɪˈtɛsɪməl/ adjective […]
Infinitival
[in-fin-i-tahy-vuh l] /ˌɪn fɪn ɪˈtaɪ vəl/ adjective, Grammar. 1. of or relating to the .

Infinitive
[in-fin-i-tiv] /ɪnˈfɪn ɪ tɪv/ Grammar noun 1. a verb form found in many languages that functions as a noun or is used with auxiliary verbs, and that names the action or state without specifying the subject, as French venir “to come,” Latin esse “to be,” fuisse “to have been.”. 2. (in English) the simple or […]
Infinitively
[in-fin-i-tiv] /ɪnˈfɪn ɪ tɪv/ Grammar noun 1. a verb form found in many languages that functions as a noun or is used with auxiliary verbs, and that names the action or state without specifying the subject, as French venir “to come,” Latin esse “to be,” fuisse “to have been.”. 2. (in English) the simple or […]