conglomerate

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

• intransitive verb To form or gather into a mass or whole.
• intransitive verb To form into or merge with a corporate conglomerate.
• intransitive verb To cause to form into a mass or whole.
• noun A corporation made up of a number of different companies that operate in diversified fields.
• noun A collected heterogeneous mass; a cluster.
• noun Geology A coarse-grained sedimentary rock consisting of rounded to subangular rock fragments cemented together by hardened silt, clay, calcium carbonate, or similar material.
• adjective Gathered into a mass; clustered.
• adjective Geology Made up of loosely cemented heterogeneous material.

from The Century Dictionary.

• To gather into a ball or round body; collect into a round mass.
• To bring together into a mass or heap; collect and form into a whole, without regard to congruity or homogeneity; form a conglomeration of.
• Gathered into a ball or round body; collected or clustered together.
• In botany, densely clustered.
• In entomology, gathered irregularly in one or more spots, instead of being distributed evenly over the surface: said of hairs, punctures, dots, etc.
• Composed of heterogeneous or incongruous materials; conglomerated.
• noun In geology, a rock made up of the rounded and water-worn debris of previously existing rocks, consisting, at least in part, of fragments large enough to be called pebbles. Also called conglomerate rock.
• noun Anything composed of heterogeneous or incongruous materials.

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

• adjective Gathered into a ball or a mass; collected together; concentrated.
• adjective (Bot.) Closely crowded together; densly clustered.
• adjective (Geol.) Composed of stones, pebbles, or fragments of rocks, cemented together.
• noun That which is heaped together in a mass or conpacted from various sources; a mass formed of fragments; collection; accumulation.
• noun (Geol.) A rock, composed or rounded fragments of stone cemented together by another mineral substance, either calcareous, siliceous, or argillaceous; pudding stone; -- opposed to agglomerate. See Breccia.
• transitive verb To gather into a ball or round body; to collect into a mass.

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

• noun A cluster of heterogeneous things.
• noun business A corporation formed by the combination of several smaller corporations whose activities are unrelated to the corporation's primary activity.
• noun geology A rock consisting of gravel or pebbles embedded in a matrix.
• adjective Clustered together into a mass.
• verb To combine together into a larger mass.
• verb business To combine together into a larger corporation.

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

• verb collect or gather
• adjective composed of heterogeneous elements gathered into a mass
• noun a group of diverse companies under common ownership and run as a single organization
• noun a composite rock made up of particles of varying size