different between ostend vs ostension

English

Latin ostendere (“to show”).

ostend (third-person singular simple present ostends, present participle ostending, simple past and past participle ostended)

(obsolete) To exhibit; to manifest.
- J. Webster
  Mercy to mean offenders we'll ostend.

Borrowed from Middle French ostension, in turn from Latin ostensi?, ostensi?nem.

ostension (countable and uncountable, plural ostensions)

(philosophy) The act of presenting an ostensive definition.
(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.

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