The term Perfect is derived from Latin perfectus meaning "achieved, finished, completed".
The perfect tense or aspect is a verb form that indicates that an
action or circumstance occurred earlier than the time under
consideration, often focusing attention on the resulting state
rather than on the occurrence itself.
In some analyses, perfect is identified as one of the grammatical
aspects. In the perfect aspect, the event being referred to is
viewed as already completed at the time of reference.
In modern grammars, particularly of English, perfect denotes an
aspect independent of tense – the form corresponding to the
traditional perfect ("I have done") is then called the present
perfect, while that corresponding to the pluperfect ("I had done")
is called the past perfect. (There are also additional forms such as future perfect, conditional
perfect, and so on). The formation of the perfect in English, using
forms of an auxiliary verb (have) together with the past participle of
the main verb, is paralleled in a number of other modern European
Refer to this Wikipedia page for more information on the perfect tense.