quid pro quo /kwid prō kwō/

1. Something given or taken as equivalent to another, often as retaliation or in return for a previous favour
2. The action or fact of giving or receiving thus

• Seventh-day Adventists
• seventh heaven
• seventhly
• sevenths
• seventies
• seventieth
• seventieths
• seventy
• seventy-eight
• seventy-eights
• seven wonders of the world
• Seven Wonders of the World
• Seven Works of Corporal Mercy
• Seven Works of Spiritual Mercy
• seven-year itch
• Seven Years' War
• sever
• severable
• several
• severalfold
• severally
• severals
• severalties
• severalty
• severance