Entry 1 sense Webster, 1913 Effulgent · Ef·ful·gent · IPA /ɪˈfʌld͡ʒənt/ 01 a. Diffusing a flood of light; shining; luminous; beaming; bright; splendid. 1. Diffusing a flood of light; shining; luminous; beaming; bright; splendid.