perfect with respect to a temporal point of reference in time to come; completed with respect to a time in the future, especially when incomplete with respect to the present.
2.
noting or pertaining to a tense or other verb formation or construction with such reference.
3.
the future perfect tense.
4.
another verb formation or construction with future perfect meaning.
5.
a form in the future perfect, as He will have come.
Origin
1895-1900
British Dictionary definitions for future perfect
future perfect
adjective
1.
denoting a tense of verbs describing an action that will have been performed by a certain time. In English this is formed with will have or shall have plus the past participle