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An object is a thing.
Also known as
Another word used in this context is entity.
In his idiosyncratic style, he used the word thing.
- 1965: Seth Warner: Modern Algebra ... (next): Chapter $1$: Algebraic Structures: $\S 1$: The Language of Set Theory
- 1975: T.S. Blyth: Set Theory and Abstract Algebra ... (previous) ... (next): $\S 1$. Sets; inclusion; intersection; union; complementation; number systems
- 1975: Bert Mendelson: Introduction to Topology (3rd ed.) ... (previous) ... (next): Chapter $1$: Theory of Sets: $\S 2$: Sets and Subsets
- 1977: William Warren Bartley, III: Lewis Carroll's Symbolic Logic
- 1993: Keith Devlin: The Joy of Sets: Fundamentals of Contemporary Set Theory (2nd ed.) ... (previous) ... (next): $\S 1$: Naive Set Theory: $\S 1.1$: What is a Set?