A grammatical tense (or category) that indicates completion of an action or its resulting state (e.g., English present perfect, past perfect).
英語の現在完了は完了時制の一例だ。
The English present perfect is an example of the perfect tense.
完了時制は動作の完了や結果を強調するときに使われる。
The perfect tense is used to emphasize the completion of an action or its result.
言語学の教科書には完了時制の比較が載っている。
Linguistics textbooks include comparisons of perfect tenses.