1. the part of a telephone, headphone, or hearing aid that is placed against or in the ear
2. the part of eyeglasses that extends over the ear

Examples

• She held the phone’s earpiece close to her ear.
• The earpiece on my headphones is comfortable for long listening sessions.
• His hearing aid’s earpiece needed to be cleaned regularly.
• The broken earpiece on his glasses made them slide down his nose.
• The security guard adjusted his radio earpiece.
• One earpiece of her sunglasses was loose and wobbly.