1) Aspect of a verb 2) Perfect 3) Perfect tense 4) Perfective tense 5) Tense 
• (a.) Tending or conducing to make perfect, or to bring to perfection; -- usually followed by of.
Per·fect'ive adjective Tending or conducing to make perfect, or to bring to perfection; -- usually followed by of . 'A perfective alteration.' Fuller. « Actions perfective of their natures.» Ray. 
[n] - a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) 2. [n] - the aspect of a verb that expresses a completed completed action
perfect noun a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect)perfective aspect noun the aspect of a verb that expresses a completed action