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ἐστί

Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ -> The fool laughs even when there's nothing to laugh at
Menander

French (Bailly abrégé)

3ᵉ sg. prés. de εἰμί.

English (Strong)

third person singular present indicative of εἰμί; he (she or it) is; also (with neuter plural) they are: are, be(-long), call, X can(-not), come, consisteth, X dure for a while, + follow, X have, (that) is (to say), make, meaneth, X must needs, + profit, + remaineth, + wrestle.

Russian (Dvoretsky)

ἐστί: 3 л. sing. praes. к εἰμί.