1. Moderately formal; requiring a dinner jacket
   "he wore semiformal attire"
   - semi-formal, black-tie

See also: formal

• sorghum molasses
• Sorghum vulgare caudatum
• Sorghum vulgare rosburghii
• Sorghum vulgare technicum
• sorgo
• Soricidae
• sorites
• sororal
• sororicide
• optical telescope
• optically
• optician
• optics
• optimal
• optimally
• optimisation
• optimise
• optimism
• optimist
• optimistic
• optimistically
• optimization
• optimize
• optimum
• option