词源元素,源自盎格鲁-撒克逊语,表达运动、方向、添加;不真正是前缀,而是介词 to 与后续词融合。这在中古英语中很常见 (to-hear "listen to," to-knit "bind up," to-cast "add together," tocome "arrive, occur, happen;" to-put "affix," to-set, to-stick, to-yield "give up," 等),但很少有幸存: to-do, together, 以及时间参考如 today, tonight, tomorrow — 乔叟也有 to-yeere。
也可以比较中古英语 towhile (conj., adv.) "for as long as; in the meantime." 但在 toward 中,to 是主要元素,而 -ward 是后缀。