SYN: Round, spherical.
ANT: Lineal, direct.
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KEY: Circulate.
SYN: Disseminate, disuse, propagate, publish, notify, spread, travel.
ANT: Suppress, avert, hush, cease, stagnate.
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KEY: Circumference.
SYN: Periphery, enclosure, circuit, outline, boundary.
ANT: Diameter, crossing, bisection, transection, transversion.