1. Singing without instrumental accompaniment
   - a capella singing

Derived forms: a cappella singings

Type of: singing, vocalising [Brit], vocalizing

• double stopping
• double take
• double talk
• double time
• double tongue
• double up
• double vision
• double-barreled
• double-barrelled
• double-bedded
• double-bitted ax
• double-bitted axe
• double-blind experiment
• double-blind procedure
• double-blind study
• double-bogey
• double-breasted
• double-breasted jacket
• double-breasted suit
• double-check
• double-chinned
• double-click
• double-crosser
• double-crossing
• double-dealer