участие

Borrowed from Russian участие (učastije).

• IPA^(key): [oˈt͡ʃa̟stiɛ]

уча́стие • (učástie) n

1. participation
2. (figurative) contribution, due share

• уча́стник m (učástnik), уча́стничка f (učástnička, “participant”)
• прича́стие (pričástie, “communion”)
• ща́стие (štástie, “fortune”)

• “участие”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• “участие”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010

Inherited from Old East Slavic участие (učastije), from Old Church Slavonic оучѧстиѥ (učęstije). By surface analysis, участь (učastʹ) +‎ -ие (-ije). The modern meanings arose due to French influence, compare French avoir part and French prendre part, which were calqued as принима́ть уча́стие (prinimátʹ učástije, “to take part”).

• IPA^(key): [ʊˈt͡ɕæsʲtʲɪje]

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уча́стие • (učástije) n inan (genitive уча́стия, nominative plural уча́стия, genitive plural уча́стий)

1. participation, collaboration, complicity

   приня́ть уча́стие ― prinjátʹ učástije ― to take part

2. share, stake
3. sympathy, interest, concern

• уча́ствовать (učástvovatʹ)
• уча́стливый (učástlivyj)
• уча́стник (učástnik)
• уча́стница (učástnica)