Entry 1 sense Webster, 1913 Diffused /dĭf-yo͞ozd'/ · Dif·fused · IPA /dɪfjˈuːzd/ 01 a. Spread abroad; dispersed; loose; flowing; diffuse. 1. Spread abroad; dispersed; loose; flowing; diffuse. “It grew to be a widely diffused opinion.” — Hawthorne.