 The Quinean response to the One Over Many argument is often couched in terms of a criterion of ontological commitment. A criterion of ontological commitment is a principle that tells us when we are committed to believing in objects of a certain kind in virtue of having assented to certain sentences. What the above response to the One Over Many suggests is that we are ontologically committed not by predicates like ‘is red’ and ‘is a rock’, but by singular terms. (A singular term is just a denoting phrase, i.e., an expression that purports to refer to a specific object, e.g., proper names like ‘Mars’ and ‘Clinton’, certain uses of pronouns like ‘she’, and on some views, definite descriptions like ‘the oldest U.S. senator’.) More specifically, the idea here seems to be this: if you think that a sentence of the form ‘a is F’ is true, then you have to accept the existence of the object a, but you do not have to accept the existence of a property of Fness; for instance, if you think that ‘The ball is red’ is true, then you have to believe in the ball, but you do not have to believe in redness; or if you think that ‘Fido is a dog’ is true, then you have to believe in Fido but not in the property of doghood.