Incorrect spelling, explanation: this spelling is incorrect, and can be mistaken with older usage of the correct form thorough which had also a preposition or adverb meaning in the past. There is no such form as
throught in English.
Correct spelling, explanation: The correct spelling of this adjective is thorough and comes from Middle English thorow. In older, archaic usage it had also a preposition/adverb meaning and was used similarly to through, which may be the explanation for the mistaken form throught.
Definition of thorough:
1. adjective, performed carefully, with care for details
She made a very thorough survey for her master thesis.
2. adjective, a person who cares about details a lot
Mark is a hard-working, careful and thorough person.
3. (archaic) adverb/preposition, through
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