This adjective describes exactness and precision in various domains. When applied to measurements, times, or descriptions, it means accurate or precise—returning at the exact moment, complete calm with no disturbance. Applied to persons, it characterizes those who are strict, careful, or sharp-sighted in their judgments or observations. The adverb form appears frequently in phrases meaning 'to know precisely' or 'to learn accurately,' standing in contrast to knowing something only roughly or in outline.