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Webster 1913 Edition

Noun.

[L.

ostensio

a showing: cf. F.

ostension

. See

(Eccl.)

The showing of the sacrament on the altar in order that it may receive the adoration of the communicants.

ostension ‎(countable and uncountable, plural ostensions)

(philosophy) The act of ostending, of presenting an ostensive definition.
- 2008 November 22, Richard Fumerton, “Luminous enough for a cognitive home”, in Philosophical Studies, volume 142, number 1, DOI:10.1007/s11098-008-9301-6:
  And ostension is one perfectly familiar way of introducing a concept.
(obsolete) An act of showing or demonstrating.
(Christianity) The showing of the sacrament on the altar in order that it may receive the adoration of the communicants.