Definitions: (1) conforming with fact or logic; true; free from errors; accurate; right; (2) in accordance with acknowledged or accepted standards; proper

Derivation: Latin,  “made straight, amended, guide”

Synonyms: exact, faultless, precise

• An error doesn’t become a mistake until you refuse to correct it. — Orlando Aloysius Battista (1917–1995) Canadian-American chemist
• A man must be big enough to admit his mistakes, smart enough to profit from them, and strong enough to correct them. — John Calvin Maxwell (1947-) American author and pastor