Entry 2 senses · 2 variants Webster, 1913 Furthest /fẽrth'-əst/ · Fur·thest · IPA /ˈfɜː(ɹ)ðɪst/ a. adv. 01 a. superl. Most remote; most in advance; farthest. See Further, a. 1. superl. Most remote; most in advance; farthest. See Further, a. See: Further 02 adv. At the greatest distance; farthest. 1. At the greatest distance; farthest.