taru-adjective, adverb taking the 'to' particle
accurate; exact; punctual; neat
Describes something done precisely, on time, or in an orderly manner. Often used adverbially with と.
He is punctual about time.
I neatly organized the documents.
fair and square; open and aboveboard; bold and forthright
Standard kanji spelling with iteration mark.
Alternative spelling without iteration mark; less common but still seen.
Reduplication of 正 (せい, 'correct, proper'), forming a taru-adjective/adverb. The exact historical derivation is uncertain, but the form follows a classical pattern for adverbial expressions.