See ordinal number for more or·din·alBrE /ˈɔːdɪnl/ 🔊NAmE /ˈɔːrdənl/ 🔊 (also ˌordinal ˈnumber) nouna number that refers to the position of sth in a series, for example 'first', 'second', etc. 序数词（如第一、第二等） ➡ compare cardinal noun (2) ▸ or·din·al adjective