Teaching

google

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Old English tǣcan ‘show, present, point out’, of Germanic origin; related to token, from an Indo-European root shared by Greek deiknunai ‘show’, deigma ‘sample’.

wiktionary

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From Middle English teching, techinge, from Old English tǣċing, tǣċung(“instruction, direction, teaching”), equivalent to teach +‎ -ing.

From Middle English techinge, techynge, techende, techand, from Old English tǣċende, from Proto-Germanic *taikijandz, present participle of Proto-Germanic *taikijaną(“to show, point out”), equivalent to teach +‎ -ing.

etymonline

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teaching (n.)

Old English tecunge "act of teaching," verbal noun from teach (v.). As "that which is taught" from c. 1300.