Entry 2 senses Webster, 1913 Thereto /thĕr'-to͞oˌ/ · There·to · IPA /ˌðɛɚˈtuː/ 01 adv. To that or this. 1. To that or this. 2. Besides; moreover.[Obs.] “Her mouth full small, and thereto soft and red.” — Chaucer.