biến thiên

== Vietnamese == === Etymology === Sino-Vietnamese word from 變遷. === Pronunciation === (Hà Nội) IPA(key): [ʔɓiən˧˦ tʰiən˧˧] (Huế) IPA(key): [ʔɓiəŋ˦˧˥ tʰiəŋ˧˧] (Saigon) IPA(key): [ʔɓiəŋ˦˥ tʰiəŋ˧˧] === Verb === biến thiên to vary; to change in value === Noun === biến thiên variation