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Plural noun sense. We do not have the singular as a noun, and I can't find it it any of my dictionaries. SemperBlotto 10:49, 13 December 2007 (UTC)
It looks so plausible, except that you would think it would be in the singular as well. If it were real, it would be pronunced to rhyme with the noun "aggregate", presumably. I couldn't find anything with the sense given searching for "crystal" and ("congregates" or "congregate") on g.b.c. and Scholar. DCDuring 22:22, 14 December 2007 (UTC)