Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: synchronization

sync

1 noun
     
sync1 , synch
1

in sync (with something/somebody)

a) if things are in sync, they are working well together at exactly the same time and speed
be/move/work in sync
The two mechanisms have to work in sync.
The soundtrack is not quite in sync with the picture.
b) matching or in agreement:
a celebrity who is in sync with young people's lifestyles
The President is in sync with Thompson's views on many issues.
2

out of sync (with something/somebody)

a) if things are out of sync, they are not working well together at exactly the same time and speed
b) not matching or not in agreement
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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