1. done by one person or group without consulting others
2. affecting or involving only one side
Usage: often medical or anatomical

Examples

• The president made a unilateral decision to withdraw troops.
• The company’s unilateral changes to the contract upset employees.
• She suffered unilateral hearing loss in her left ear.
• The unilateral ceasefire was announced without prior negotiations.
• His unilateral approach to management created tension in the team.
• The patient experienced unilateral weakness on the right side.
• The treaty was terminated by unilateral action.