Plural of 'circularization': multiple instances or processes of making circular or distributing circulars.
From 'circularization' plus the regular plural '-s.' The root chain is Latin 'circulus' + Old French '-ize' + Latin '-ation' + English plural '-s.'
Most English plurals are dead simple, but words like 'circularizations' show how English can stack multiple affixes (prefixes and suffixes) to build complex meanings from ancient roots.
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