Semiformal

"The HLA defines the rules of interoperability, a semiformal methodology for specifying simulation and federation object classes, and the interface specification that is a precise specification of the functional actions that a simulation may invoke."

"Suits have largely replaced guayabera shirts as business and semiformal wear for middle and upper-class Panamanian men, made practical by the widespread use of air-conditioning in the cities."

"The skirt was way too short, at least shorter than she preferred. It left exposed a good eight inches between her knee and thigh. But what choice did she really have? Casual cropped pants were hardly appropriate attire for a semiformal event."

"Bright-colored flyers decorated battered lockers, telling everyone to join the debate team, try out for the school play, and not to miss the fall semiformal this Friday. I wondered what a "semiformal" consisted of at a public school, not that I'd bothered to ask anyone."