English
forethinker
From forethink + -er.
Formed from forethink + -er
Proto-Indo-European *teng- ‘to think, feel, perceive, know’
…
Proto-West Germanic *þankijan ‘to think’
Old English þenċan ‘to think’
Old English fōreþenċan ‘to premeditate, consider, be mindful’
Middle English forethynken
English forethink
Today it means
noun One who thinks ahead, or plans things in advance.
Language periods are conventional ranges, not dates for this word.
Etymograph / forethinker