/ˈɔ:dɪnl; US -dənl ||; ˈɔrdṇəl/(also ˌordinal ˈnumber) noun [C] a number that shows the order or position of sth in a series 序数词: ‘First’, ‘second’, and ‘third’ are ordinals. first、second、third是序数词。 ☞Look at cardinal. 参看cardinal。