noun
plural -tions
the special purpose or activity for which a thing exists or is used [count]
[count] :the job or duty of a person
[count] :a large ceremony or social event
[count] something (such as a quality or measurement) that is related to and changes with something else
something that results from something else
verb
-tions; -tioned; -tioning
[no obj]
to work or operate
to have a specified function, role, or purpose :serve
usually + as