insertion

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act or process of inserting.
• noun Something inserted, as an ornamental strip of lace or embroidery inserted between pieces of fabric.
• noun Anatomy The point or mode of attachment of a skeletal muscle to the bone or other body part that it moves.
• noun Genetics The addition, as by mutation, of one or more nucleotides to a chromosome.

from The Century Dictionary.

• noun A putting in; the act of inserting, or placing, or setting something in or among other things: as, the insertion of a beam in a wall.
• noun That which is inserted.
• noun A band of lace or other ornamental material inserted in a plain fabric for decorative purposes. Such bands are often made with both edges alike, and with a certain amount of plain stuff on either side, to allow them to be sewed on strongly.
• noun Place or manner of attachment.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of inserting
• noun The condition or mode of being inserted or attached.
• noun 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.
• noun (Anat.) The point or part by which a muscle or tendon is attached to the part to be moved; -- in contradistinction to its origin.
• noun (Bot.) the insertion of stamens upon the ovary.
• noun (Bot.) insertion beneath the ovary.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of inserting, or something inserted.
• noun anatomy The distal end of attachment of a muscle to a bone that will be moved by the muscle.
• noun genetics The addition of a nucleotide to a chromosome by mutation

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a message (spoken or written) that is introduced or inserted
• noun the act of putting one thing into another