[From Latin objectum: that which is presented to consciousness.]
(metaphysics) The doctrine that reality exists outside of the mind and that entities retain their identity no matter what human beings think or feel about them (colloquially captured in the phrase 'wishing doesn't make it so'). Historically, a less common word for realism, in opposition to subjectivism.
(ethics) The view that there are naturalistic or non-subjective standards of value and conduct; another term for naturalism.
(philosophy) The self-described name for Ayn Rand's philosophy; see Randianism.