Correct spelling, explanation: -th is a suffix that forms abstract nouns of condition or quality. Therefore the correct form is length, not
lenght. Just like other abstract nouns which describe conditions, such as width, length is spelled with -th.
Definition of length:
noun, extent from end to end of something
The length of the river is 150km.
The city council wants to double the length of the local railway.
Incorrect spelling, explanation:
lenght is an incorrect form because -th is a suffix describing a condition. Therefore in such words as depth, width, or length the ending is -th, not -ht. Length is thus the correct spelling of this noun.
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