An apparent misspelling or variant of 'diagonal'; relating to or resembling a diagonal line or direction.
This appears to be a non-standard spelling variant of diagonal, possibly from confusion with the Latin ending -ial. It's not a standard English word in most dictionaries.
This word is likely a spelling error that reveals how tricky English can be—'diagonal' comes from Greek but sounds like it should end in -ial like many Latin-derived words. Language learners often create variants like this when trying to regularize inconsistent spelling patterns.
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