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ἔστω

Μή, φίλα ψυχά, βίον ἀθάνατον σπεῦδε, τὰν δ' ἔμπρακτον ἄντλει μαχανάν -> Oh! my soul do not aspire to eternal life, but exhaust the limits of the possible
Pindar, Pythian, 3.61f.

French (Bailly abrégé)

3ᵉ sg. impér. de εἰμί.

English (Strong)

second person singular present imperative of εἰμί; be thou; also estosan, third person of the same let them be: be.

Russian (Dvoretsky)

ἔστω: 3 л. sing. imper. к εἰμί.