1. (Adverb) an interrogative adverb to ask the time at which an event took place or would take place কোনো হৈ যোৱা বা হ’ব লগীয়া ঘটনাৰ সময় সুধিবলৈ ব্যৱহাৰ কৰা প্ৰশ্নবোধক অব্যয়

English: when,
Assamese: কাহানি, কাহানিকৈ, কিততে _bo , কেতি-বেৰি, কেতিয়া, কেতিয়াকৈ, কৈসানি, কোন দিনা,
Bodo: माब्ला,
Mising: delokke, douem, edi, edilo,
Khasi: haba,
Garo: basako,
Meeteilon: karamkan, keidoungei,
Karbi: komantu, konam, konamtu, mentulo,
Nagamese: ketia, kitya,
Dimasa: bakhali,
Chakma: hokkeneh,
Bangla: কখন,
Nepali: कति खेर, कतिबेर, कुनबेला, कुनसमय, कैले,
Tiwa: pakhal,
Deori: জিবহ, দাম-কাৰি, দুম,
TAI-Turung: klenyong,
Singpho: galoi,
Tutsa: maba

2. (Verbal Adj.) Used after an expression of time to mean ‘at which time’ or ‘on which time’. যি সময়ত ।

English: when,
Assamese: যেতিক্ষণে, যেতিয়া, যেবে, যৈসানি,
Mising: dosem, iddom,
Nagamese: jetia, jitia, zetia

Related Idea:

a. Conjuction: while, dodeng, dosem, edi, katba...

3. (Adverb) at or at which by referring to a time or circumstance.

English: when,
Khasi: lano