1. moderately formal in style, dress, or manner; less formal than formal but more formal than casual

Examples

• The wedding reception had a semiformal dress code.
• She wore a semiformal dress to the company dinner.
• The event was semiformal, so he chose dress pants and a nice shirt.
• Most guests interpreted semiformal as business casual attire.
• The restaurant has a semiformal atmosphere with tablecloths but no jacket requirement.
• For the semiformal dance, students dressed up but not in full evening wear.