KEY: Concourse.
SYN: Assembly, assemblage, crowd, throng, convergence, mob.
ANT: Cabinet, conclave, cabal, dispersion, desertion, solitude.
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KEY: Concrete.
SYN: Firm, compact, consolidated, indurated, embodied, particularized.
ANT: Loose, sloppy, luteous, shifting, boggy, swampy, yielding, unresisting, abstract, generalize.
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KEY: Concur.
SYN: Approve, acquiesce, assent, coincide, meet, converge, concentrate, agree.