- 4 Grammar (of a tense) denoting a completed action or a state or habitual action that began in the past. The perfect tense is formed in English with have or has and the past participle, as in they have eaten and they have been eating (since dawn) ( present perfect), they had eaten ( past perfect), and they will have eaten ( future perfect).
Middle English: from Old French perfet, from Latin perfectus 'completed', from the verb perficere, from per- 'through, completely' + facere 'do'
In the literal sense, perfect and unique are absolute words and should not be modified, as they often are in such phrases as most perfect, quite unique, etc. See also unique (usage).