During the entire period of time, or in every part of a place.
“The pool remains open throughout the summer months, including holidays.”
“Discounted rates apply throughout the promotional period listed in the flyer.”
Diagrams describing schedules or policies often use 'throughout' to indicate that a rule applies continuously, such as 'parking is free throughout the holiday weekend.' Watch for this word when a question asks whether a rule is temporary or applies the whole time.
Synonyms: during, all through, over the course of