(1):
(n.) The condition or mode of being inserted or attached; as, the insertion of stamens in a calyx.
(2):
(n.) That which is set in or inserted, especially a narrow strip of embroidered lace, muslin, or cambric.
(3):
(n.) The act of inserting; as, the insertion of scions in stocks; the insertion of words or passages in writings.
(4):
(n.) The point or part by which a muscle or tendon is attached to the part to be moved; - in contradistinction to its origin.