The compound adjective 'teacher-initiated' is a modern formation following the productive English pattern of combining an agent noun with a past participle to denote the source of an action. The first element, 'teacher', derives from the Old English verb tǣcan, meaning 'to show, point out, or instruct', which is related to the concept of a sign or token (tācn). The second element, 'initiated', originates from the Latin initiare, meaning 'to begin', itself from initium (a beginning or entrance), related to the verb inire ('to go into'). Thus, the literal construction 'one-who-teaches having-begun' logically evolves into the abstract professional meaning describing any activity, process, or proposal that originates from an educator's agency.

Structure: teacher (one who teaches) + initiated (started) - teacher: Origin: Old English tǣcan (to show, instruct) + agent suffix -er. Functional role: Noun base, specifying the agent. - initiated: Origin: Latin initiatus, past participle of initiare (to begin), from initium (beginning). Functional role: Past participle verb, indicating the action performed.