Present in a minor amount, and not essential.
Auxiliary or accessory:
Designating or of any of the noncombat ships, as tankers or tenders, that form the service fleet of a navy
Accompanying or existing in a subordinate, corroborative, or indirect relationship
The definition of subsidiary is something that gives support, something that is secondary in importance or an organizational group that is in a lower organizational position.
The definition of supportive is someone or something who provides emotional help and encouragement.
Tending to cause or bring something about; contributive:
Giving or able to give help or support
(Obsolete) Acting in common; participating.
tending to bring about; being partly responsible for
Tributary means paying tribute or contributory.
Having made no legal will:
Find another word for contributory. In this page you can discover 18 synonyms, antonyms, idiomatic expressions, and related words for contributory, like: accessory, ancillary, assistant, auxiliary, collateral, subsidiary, supportive, conducive, contributive, help and participate.