Inherited from Old East Slavic сърокъ (sŭrokŭ), original meaning "agreement", from Proto-Slavic *sъrokъ.
срок • (srok) m inan (genitive сро́ка, nominative plural сро́ки, genitive plural сро́ков)
- period, span
- date, term, time
- Vasmer (Fasmer), Max (Maks) (1964–1973), “срок”, in Etimologičeskij slovarʹ russkovo jazyka [Etymological Dictionary of the Russian Language] (in Russian), translated from German and supplemented by Trubačóv Oleg, Moscow: Progress