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āīchchhik a 1. voluntary [कल्याण welfare, प्रयत्न effort, चंदा subscription, संस्था institution]. 2. optional [वाक्य sentence, सेवा service].

vaikalpik a alternate, optional [उत्तर response, कार्य function, मार्ग route, विषय subject, व्यवस्था arrangement]. [syn. ऐच्छिक, from विकल्प]