Iōng-gí-ha̍k (Eng-gí: terminology) sī tùi iōng-gí kap in-ê sú-iōng ê gián-kiù. Iōng-gí ū khó-lêng sī tan-jī, cho͘-ha̍p tan-ji̍p (compound word), iā chē-ê tan-jī ê piáu-ta̍t, in tī it-tēng ê siōng-hā-bûn tang-tiong ū it-tēng ê ì-sù; chit-ê ì-sù ū khó-lêng sī thoat-lî liáu kâng jī goân-té tī ji̍t-siông giân-gí ê ì-sù.