Etymology
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conglomerate (adj.)

"gathered into a ball or rounded mass," 1570s, from Latin conglomeratus, past participle of conglomerare "to roll together, concentrate, heap up," from assimilated form of com "with, together" (see con-) + glomerare "to gather into a ball, collect," from glomus (genitive glomeris) "a ball, ball-shaped mass," possibly from PIE *glem- (see glebe).

conglomerate (n.)

1809, in geology, "a rock made up of pebbles and other water-worn debris from previous rocks," from conglomerate (adj.). General sense of "anything comprised of heterogeneous or incongruous materials" is from 1831.  Specific sense "large business group" is from 1963, short for conglomerate corporation. Related: Conglomeratic.

conglomerate (v.)

1590s, transitive, "to form into a ball, to gather into a ball or round body," from Latin conglomeratus, past participle of conglomerare "to roll together, concentrate, heap up," from assimilated form of com "with, together" (see con-) + glomerare "to gather into a ball, collect," from glomus (genitive glomeris) "a ball, ball-shaped mass," possibly from PIE *glem- (see glebe). Intransitive sense of "to come together in a rounded mass" is from 1640s. Related: Conglomerated; conglomerating.

updated on March 07, 2018

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Definitions of conglomerate from WordNet
1
conglomerate (n.)
a composite rock made up of particles of varying size;
Synonyms: pudding stone
conglomerate (n.)
a group of diverse companies under common ownership and run as a single organization;
Synonyms: empire
2
conglomerate (v.)
collect or gather;
Synonyms: accumulate / cumulate / pile up / gather / amass
3
conglomerate (adj.)
composed of heterogeneous elements gathered into a mass;
the conglomerate peoples of New England
From wordnet.princeton.edu, not affiliated with etymonline.