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Âng-soàⁿ sī tī Cartesian-bīnê hâm-sò͘ f. Hoâiⁿ-te̍k (-軸) sī su-ji̍p x, jî-chhiáⁿ ti̍t-te̍k tāi-piáu su-chhut f(x), só͘-í chit tiuⁿ tô͘ kā só͘-ū iú-sū-tùi (有序對) (x, f(x)) pau tī lāi-té.
Hâm-sò͘ (函數, Eng-gí: function)[1], mā kiò chò koan-sò͘ (關數), sī chi̍t thò su-ji̍p kap khó-lêng ê su-chhut ê koan-hē, koh su-ji̍p ū it-tēng ê tùi-ēng su-chhut. Kán-tan ê kí-lē tio̍h pí-lūn jīn-hô si̍t-sò͘ x kap i-ê pêng-hong 
ê koan-hē. Sò͘-ha̍k siōng tiāⁿ ēng "f(x)" lâi piáu-ta̍t hâm-sò͘ koan-hē, "x" tāi-piáu su-ji̍p, f sī koan-sò͘, f(x) sī su-chhut.
- ↑ Tû-liáu Hôa-gí, Hàn-jī-khoan kok-kok mā hō-chò 函數 (Hân: 함수, Ji̍t: 函数, Oa̍t: Hàm số), āu-lâi Ji̍t-pún hān-chè hàn-jī sú-iōng, chiah chia̍p-chia̍p iōng 関数.
