What does "scheduler" mean?

A person or device that determines a schedule, that determines the order that tasks are to be done.

Scheduler

Common synonyms include: appointment manager, arranger, booking system, calendar, coordinator, coordinators.

noun

noun ·3 syllables ·Rare ·Advanced level

Noun

1
A person or device that determines a schedule, that determines the order that tasks are to be done.
2
computer hardware that arranges jobs to be done by the computer in an appropriate order wordnet
3
An operating system component responsible for allocating several resources, most commonly the use of processors by different concurrent processes or threads.

"I use Outlook's scheduler at work and I think I'd like to buy a PDA and synchronize them."

From schedule + -er.