W1S3 [θru:ˈaut] prep, adv
1.) in every part of a particular area, place etc
a large organization with offices throughout the world
The disease spread rapidly throughout Europe.
The house is in excellent condition, with fitted carpets throughout.
2.) during all of a particular period, from the beginning to the end
We are open every weekend throughout the year.
He was involved in politics throughout his life.
The debate continued, but Meredith remained silent throughout.

Dictionary of contemporary English. 2013.