If three volumes is a trilogy, what is a four-volume series called?

Quartet i believe and if u want to read a good quartet then read The Alexandria Quartet - its pretty good

Define Trilogy

"quadrilogy

A story contained in four parts.

Mostly known from the title of the boxset of Aliens-series films, "Alien Quadrilogy." An awkward mix of Greek and Latin, seen as incorrect by some linguists (despite the common word "television" being a similar combination of Greek and Latin). The Latin-rooted word "tetralogy" means the same thing and avoids the awkwardness."

Vick is right. Lawrence Durrell's "Alexandria Quartet" is never called anything but a quartet. The four books are Justine, Clea, Mountolive, and Balthazar.

I've heard "quartet" more commonly used for a 4 volume series...but it probably depends on what the author wants to call his/her work in the end.

" A trilogy in four parts" - Douglas Adams

Hitchhikers Guide To The Galaxy.

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It is not a dumb question. My answer is a four volume series is over kill on the subject.

A quartet.

four-volume series or saga is most common (quartet is rarely used)

a quartet, for example the time quartet by madeline l'engel (great books by the way!)