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Old English word þencan comes from Proto-Indo-European *tong-, and later Proto-Germanic *þankijaną (To perceive, to think.)
*tong- (Proto-Indo-European)
*þankaz (Proto-Germanic)
Gratitude; thanks. Remembrance. Thought; mind; consideration.
*þankijaną (Proto-Germanic)
To perceive, to think.
þencan (Old English)
To think.