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From The Collaborative International Dictionary of English v.0.48:
Insertion \In*ser"tion\, n. [L. insertio: cf. F. insertion. See Insert.] [1913 Webster] 1. The act of inserting; as, the insertion of scions in stocks; the insertion of words or passages in writings. [1913 Webster] 2. The condition or mode of being inserted or attached; as, the insertion of stamens in a calyx. [1913 Webster] 3. That which is set in or inserted, such as a word or passage in a composition, or a narrow strip of embroidered lace, muslin, or cambric; as, there were numerous insertions and corrections to the first draft. [1913 Webster +PJC] 4. (Anat.) The point or part by which a muscle or tendon is attached to the part to be moved; -- in contradistinction to its origin. [1913 Webster] Epigynous insertion (Bot.), the insertion of stamens upon the ovary. Hypogynous insertion (Bot.), insertion beneath the ovary. [1913 Webster]