IPA: /ˈæn.sɪ.lɛr.i/
KK: /ˈæn.sɪˌlɛr.i/
Relating to something that is secondary or supportive, often providing assistance or help to a main function or purpose.
The company offers ancillary services to enhance the main product.
Something that helps or supports another thing, often in a secondary or less important role.
The teacher provided ancillary materials to help students understand the main textbook better.
Ancillary → It is formed from "ancilla" (meaning maidservant or helper) and the suffix "-ary" (meaning pertaining to or connected with). The word "ancillary" refers to something that is providing support or assistance, akin to a helper or subordinate.
Think of a 'helper' ('ancilla') that is 'pertaining to' ('-ary') support — that's why ancillary means something that provides assistance.