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The Collaborative International Dictionary
Insition

Insition \In*si"tion\ (?; 277), n. [L. insitio, fr. inserere, insitum, to sow or plant in, to ingraft; pref. in- in + serere, satum, to sow.] The insertion of a scion in a stock; ingraftment.
--Ray.

Wiktionary
insition

n. The insertion of a scion in a stock; engraftment.