Entry 1 sense Webster, 1913 Legitimize /(lē̇*jĭt"ĭ*mīz)/ · Le·git·i·mize · IPA /ləˈd͡ʒɪtɪˌmaɪz/ 01 v. t. To legitimate. imp. & p. p. Legitimized; p. pr. & vb. n. Legitimizing 1. To legitimate.