Auxiliary
WordNet
adjective
(1) Functioning in a subsidiary or supporting capacity
"The main library and its auxiliary branches"
(2) Furnishing added support
"An ancillary pump"
"An adjuvant discipline to forms of mysticism"
"The mind and emotions are auxiliary to each other"
noun
(3) Someone who acts as assistant
WiktionaryText
Etymology
From , equiv. to < < .
Adjective
- Helping; giving assistance or support.
- Supplementary or subsidiary.
- Held in reserve for exceptional circumstances.
- Of a ship, having both sails and an engine.
- Relating to an auxiliary verb.