(category theory) Given a category C, any object X ∈ C on which morphisms are defined corresponding to the group theoretic concepts of a binary operation (called multiplication), identity and inverse, such that multiplication is associative and properties are satisfied that correspond to the existence of inverse elements and the identity element.

(object-oriented programming) An object that mimics the behavior of a real object in a controlled way, often used as part of unit testing.

(grammar) In some languages, e.g. in Finnish, an object that indicates incomplete action, as opposed to total object that indicates completed action.

(grammar) In some languages, e.g. in Finnish, an object that indicates completed action, as opposed to partial object that indicates incomplete action.

plural of objective synonym

(taxonomy) A synonym when the names being synonymized have the same type, making them objectively identical.

(archaeology) The initial piece of stone from which a tool is made.

plural of objective piece

(accounting) Something to which costs are assigned; anything for which a separate measurement of cost is required.

(psychology) An object, such as a security blanket or stuffed toy, used by a young child to self-soothe and cope with separation from a parent or other attachment figure.