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From Proto-Italic *enim, accusative singular of *eno (“that one”), from Proto-Indo-European *h₁ enos (“that”). Cognates include nam, nē (“truly”), Ancient Greek νή (nḗ), ναί (naí).

enim (always postpositive)

truly, verily, really, indeed

Id enim ferendum esse negat.

It was truly not to be endured.
yes
for, because

Caedite eos. Novit enim Dominus qui sunt eius.

Kill them, for the Lord knows those that are His own.
so

“ĕnim”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
“enim”, in Charlton T. Lewis (1891), An Elementary Latin Dictionary, New York: Harper & Brothers
"enim", in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
“ĕnim”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette, page 589.
“enim” on pages 607–608 of the Oxford Latin Dictionary (1st ed., 1968–82)
Niermeyer, Jan Frederik (1976), “enim”, in Mediae Latinitatis Lexicon Minus, Leiden, Boston: E. J. Brill, page 375/1

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