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duty

In a sentence
Plní si povinnosť.
He does his duty.
Plním si povinnosť.
I'm doing my duty.
Je mojou povinnosťou skontrolovať všetky doklady.
It is my duty to check all the documents.
Študenti majú povinnosť odovzdať prácu do piatka.
Students have an obligation to submit the paper by Friday.
Examples from Tatoeba (CC BY 2.0 FR).
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Includes Tatoeba example sentences when present.
Full attribution on References.