There is no really adequate definition of '''singular term'''. Here are some definitions proposed by different writers:
# A term that tells us which individual is being talked about. (
John Stuart Mill,
Arthur Prior,
P. F. Strawson)
[1]
# A term that is grammatically singular, i.e. a
proper name (''proprium nomen''), a
demonstrative pronoun (''pronomen demonstrativum'') or a demonstrative pronoun with a common name (''cum termino communi''). (
William of Ockham)
[2]
# A term that is inherently ''about'' the object to which it applies or
refers. (
Gottlob Frege)
[3]
# A term that is true "in the same sense" of only one object. (
Peter of Spain)
[4]
References
1. Strawson 1950, Prior 1976, Mill 1908
2. Ockham, ''loc. cit.''
3. Frege 1892
4. Hispanus 1947
Works cited
★ Frege, G. (1892) "On Sense and Reference", originally published as " Über Sinn und Bedeutung" in ''Zeitschrift für Philosophie und philosophische Kritik'', vol. 100, pp. 25-50. Transl. Geach & Black 56-78.
★ Mill, J.S., ''A System of Logic'', London 1908 (8th edition).
★ Petrus Hispanus, ''Summulae Logicales'', ed. I. M. Bochenski (Turin, 1947) – also quoted in Prior 1976
★ Prior, A.N. ''The Doctrine of Propositions & Terms'' London 1976
★ Strawson, P.F. "On Referring", ''Mind'' 1950 pp. 320-44.
★ William of Ockham, ''
Summa logicae'' Paris 1448, Bologna 1498, Venice 1508, Oxford 1675