bul: действаща сила

Information
has URI	http://lexvo.org/id/term/bul/%D0%B4%D0%B5%D0%B9%D1%81%D1%82%D0%B2%D0%B0%D1%89%D0%B0%20%D1%81%D0%B8%D0%BB%D0%B0

Meaning
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means	(noun) an active and efficient cause; capable of producing a certain effect; "their research uncovered new disease agents" agent