1 [countable/uncountable] the way in which a set of things is arranged or done, so that it is clear which thing is first, second, third etc
in order (=in the correct order):
Please try to keep the pictures in order.
out of order (=in the wrong order):
Some of the names on the list are out of order.
in alphabetical/chronological/numerical order (=in order according to spelling, time, or number):
The computer puts the list in alphabetical order by last name.
in order of priority/importance/frequency etc:
We will deal with these problems in order of priority.
Synonyms and related words