What is the opposite of ancillary?

Need antonyms for ancillary? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Opposite of providing necessary support to the primary activities or operation of an organization, system, etc
Adjective
Opposite of serving as a means to an end
Adjective
Opposite of in a relationship with another set such that membership in the other set implies membership in the present set
Adjective
Opposite of having reliance on somebody or something
Adjective
Opposite of helping
Adjective
Opposite of additional to what is required for ordinary use
Adjective
Opposite of ranking below things in importance
“I know we tend to treat patients as they come, but this is a particularly urgent case.”
Adjective
Opposite of taking the place of one that came before
Noun
Opposite of a thing that is added or attached to something larger or more important
Noun
Opposite of a person or thing acting or serving in place of another
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