consolidate

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

• intransitive verb To unite into one system or whole; combine.
• intransitive verb To make strong or secure; strengthen.
• intransitive verb To make firm or coherent; form into a compact mass.
• intransitive verb To become solidified or united.
• intransitive verb To join in a merger or union.

from The Century Dictionary.

• Formed into a solid mass or system.
• To make solid or firm; unite, compress, or pack together and form into a more compact mass, body, or system; make dense or coherent.
• To bring together and unite firmly into one mass or body; cause to cohere or cleave together: as, to consolidate the forces of an army, or materials into a compound body.
• Used specifically— in surgery, of uniting the parts of a broken bone or the lips of a wound by means of applications
• in legislation, of combining two or more acts into one;
• in law, of combining two or more actions, corporations, or benefices into one;
• in finance, of uniting different sources of public revenue into a single fund, or different evidences of public debt into a single class (see consolidated). Synonyms To combine, compact, condense, compress.
• To grow firm and compact; coalesce and become solid: as, moist clay consolidates by drying.

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

• adjective rare Formed into a solid mass; made firm; consolidated.
• intransitive verb To grow firm and hard; to unite and become solid.
• transitive verb To make solid; to unite or press together into a compact mass; to harden or make dense and firm.
• transitive verb To unite, as various particulars, into one mass or body; to bring together in close union; to combine.
• transitive verb (Surg.), rare To unite by means of applications, as the parts of a broken bone, or the lips of a wound.

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

• verb To combine into a single unit; to group together or join.
• verb To make stronger or more solid.

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

• verb bring together into a single whole or system
• verb make or form into a solid or hardened mass
• verb form into a solid mass or whole
• verb unite into one
• verb make firm or secure; strengthen