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