adjunct adjunct /ˈæˌdʒəŋkt/

adjective

1. Of or relating to a person who is subordinate to another  ( adjunct , assistant )
   of or relating to a person who is subordinate to another
   
2. Furnishing added support  ( accessory , adjunct , adjuvant , ancillary , appurtenant , auxiliary )
   furnishing added support
    An ancillary pump
   an ancillary pump
    An adjuvant discipline to forms of mysticism
   an adjuvant discipline to forms of mysticism
    The mind and emotions are auxiliary to each other
   The mind and emotions are auxiliary to each other
   

noun

1. () Something added to another thing but not an essential part of it  ( adjunct )
   something added to another thing but not an essential part of it
     The telescope was an essential adjunct to their astronomical research, enabling them to observe distant galaxies.
   The telescope was an essential adjunct to their astronomical research, enabling them to observe distant galaxies.
   
2. A construction that can be used to extend the meaning of a word or phrase but is not one of the main constituents of a sentence  ( adjunct )
   a construction that can be used to extend the meaning of a word or phrase but is not one of the main constituents of a sentence
   
3. A person who is an assistant or subordinate to another  ( adjunct )
   a person who is an assistant or subordinate to another