essence of a contract
See condition.

• undertaking
• underwriter
• undischarged bankrupt
• undisclosed principal
• undivided shares
• undue influence
• unduly lenient sentence
• unemployment benefit
• unenforceable contract
• unenforceable trust
• unfair consumer practices
• unfair contract terms
• unfair dismissal
• unfair prejudice
• unfavourable witness
• UNFCCC
• unfitness or incompetence
• unfit to plead
• Unified Patent Court
• Uniform Business Rate
• unilateral contract
• unilateral discharge
• unilateral mistake
• unincorporated body
• union membership agreement