progressive aspect
Definition - (Aka continuous aspect| durative aspect)

An aspect used to show actions that are in progress at a particular time in the past, present, or future.

Example -

(1) He was eating when they left. (past progressive)
(2) He will have gone before I get there. (future perfect progressive)

Etymology -
The word progressive derives from the Latin pro, forward + gradi, to step or to walk.

Oxford English Dictionary -
The full term's first citation is from 1946:
"The distinction between the ‘terminate’ and the ‘progressive’ aspects of the verb, e.g. I go/am going, do you go/are you going?"
(Trans. Philol. Soc. 1945 130)

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