say it: ROH-tur-ee
rotary is a noun and adjective meaning "a road junction at which traffic streams circularly around a central island". It carries 4 recorded senses.
a road junction at which traffic streams circularly around a central island
“the accident blocked all traffic at the rotary”
electrical converter consisting of a synchronous machine that converts alternating to direct current or vice versa
relating to or characterized by rotation
“rotary dial”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for rotary come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.