Definition
A schedule pins events to time: it lists what will happen and, crucially, when — the 9:15 train, the Tuesday deadline, the order of a day's tasks laid out along the clock. More than a mere list, it gives each item its own slot, so a schedule can run on time or fall behind. As a verb, to schedule is to set that time. The famous US–UK split in pronunciation ('SKED-jool' versus 'SHED-yool') makes it a favourite listening-test word.
Examples
Collocations
a tight schedule·ahead of schedule·behind schedule·on schedule·a busy schedule
Synonyms
timetable·agenda·itinerary·roster·programme
Antonyms
improvisation·spontaneity
Word family
scheduling (noun)·scheduled (adjective)·rescheduling (noun)
In TOEFL & IELTS
Prized for the pronunciation split — American 'SKED-jool' versus British 'SHED-yool' — so listen for it in the Listening section. The collocations 'ahead of / behind / on schedule' and 'a tight schedule' move straight into Speaking and Writing. It works as both noun and verb ('the talk is scheduled for noon').