present participle of dure
"The ancient structure endured during the long winter storm, standing firm against the gale."
In plain English: During is not actually used as a verb; it is only an adjective that means happening at the same time as something else, so there is no correct definition for this part of speech.
"During his long illness, he spent most days in bed reading books."
For all of a given time interval.
"The train arrived during the entire hour that we waited at the station."
A surname.
"The famous author During published his latest novel last year."
During comes from the Middle English word for "lasting," which was derived from a verb meaning to endure or remain in existence. The term entered modern usage as an adjective describing something that lasts throughout a specific period of time.