say it: SAWR-tee
sortie is a noun meaning "a military action in which besieged troops burst forth from their position". It carries 2 recorded senses.
a military action in which besieged troops burst forth from their position
military
(military) an operational flight by a single aircraft (as in a military operation)
military
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 sortie 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.