OPTIONALS Antonyms

• basic and fundamental

• being or relating to or containing the essence of a plant etc

• defining rights and duties as opposed to giving the rules by which rights and duties are established

• anything indispensable

• absolutely necessary; vitally necessary

• of the greatest importance

• the recipient of a mandate

• a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they are able to stand by themselves

• required by rule

• absolutely essential

• anything indispensable

• unavoidably determined by prior circumstances

• necessary for relief or supply

• morally or legally constraining or binding

• required by obligation or compulsion or convention

• set down as a rule or guide

• fixed or established especially by order or command

• conforming to set usage, procedure, or discipline

• formally laid down or imposed

• necessary for relief or supply

• required by rule

• Something that is not negotiable.

• Not negotiable; not subject to negotiation.