Learner's definition of SEQUENCE
1 : the order in which things happen or should happen
He listened to the telephone messages in sequence.
After she dropped the photographs, they were out of sequence. [=not in order, out of order]
2 [count] : a group of things that come one after the other 3 [count] : a part of a movie, television show, etc., that deals with one subject, action, or idea