Perceptual realism See PERCEPTION.

Perceptual relativity See PERCEPTION.

Percival Thomas (1740–1804), English physician and author of Medical Ethics (1803)....

Perdurance in one common philosophical use, the property of being temporally...

Perfect competition the state of an ideal market under the following conditions:...

Perfect duty See DUTY, KANT.

Perfect right See GROTIUS, RIGHTS.

Perfectionism an ethical view according to which individuals and their actions...

Perfectionism, Emersonian See CAVELL.

Performance, linguistic See PHILOSOPHY OF LAN -. GUAG.

Performative See SPEECH ACT THEORY.

Performative fallacy See INFORMAL FALLACY.

Peripatetic School also called Peripatos, the philosophical community founded by Aristotle at...

Peripatos See HELLENISTIC PHILOSOPHY, PERI -. PATETIC SCHOO.

Perlocutionary act See SPEECH ACT THEORY.

Permissibility See DEONTIC LOGIC, EPISTEMOLOGY.

Perry Ralph Barton (1876–1957), American philosopher who taught at Harvard University...

Perseity See DIVINE ATTRIBUTES.

Person stage See PERSONAL IDENTITY.

Personal identity the (numerical) identity over time of persons. The question of...

Personal supposition See SUPPOSITIO.

Personalism a version of personal idealism that flourished in the United...

Personality See CHARACTER.

Personhood the condition or property of being a person, especially when...

Perspectivism See NIETZSCHE, ORTEGA Y GASSET,. TEICHMÜLLE.

Persuasive definition See DEFINITION.

Peter Abelard See ABELARD.

Peter Lombard (c.1095–1160), Italian theologian and author of the Book of Sentences...

Peter of Spain It is now thought that there were two Peters of...

Petitio principii See INFORMAL FALLACY.