The perfective tense is a grammatical structure used in many languages to describe completed actions or events. In some languages, it is also known as the past tense or the aorist tense. Other synonyms for the perfective tense include the simple past tense, the preterite tense, and the completed aspect. These various terms all refer to the same grammatical concept of describing actions that have been completed in the past. Additionally, some languages have variations of the perfective tense, such as the perfect aspect which describes actions completed at a specific point in time, or the pluperfect aspect which describes actions completed before another past action.