• Necessary approval
• Necessary appurtenance
• Necessary appurtenances
• Necessary changes
• Necessary condition
• Necessary corollary
• Necessary countersign
• Necessary entailment
• Necessary evil
• Necessary expedient
• Necessary expurgation
• Necessary foreplay
• Necessary formality
• Necessary funding
• Necessary inference
• Necessary information
• Necessary layover
• Necessary legwork
• Necessary measures
• Necessary microbreak