/-{-{dìngyìyù}-}-/, /tɪŋ²² jiː²² wɪk̚²/, /ding6 ji6 wik6/, /ding6 ji6 wik9/, /ding6 yi6 wig6/, /dinqyihyuh/, /dìngyìyù/、/ㄉㄧㄥˋ ㄧˋ ㄩˋ/
(數學，集合論) 函數自變數／自變量所有可取值的集合