How is defined as in what way.(adverb)
An example of how is to ask in what manner a building was constructed.
See how in Webster's New World College Dictionary
Origin: ME hwu, hu < OE, akin to OHG hweo (Ger wie), Goth hwai-wa < IE interrogative base *kwo-, *kwe- > why, who, L quo, Sans kā
See how in American Heritage Dictionary 4
Origin: Middle English howe
Origin: , from Old English hū; see kwo- in Indo-European roots.
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