tertium quid /tûrˈsh(i-)əm kwid or terˈti-ŭm/)

1. A third unknown thing related to two specific known things
2. Something intermediate between opposites
3. The third person in the eternal triangle

• Provençale
• prove oneself
• prover
• proverb
• proverbed
• proverbial
• proverbialise
• proverbialised
• proverbialises
• proverbialising
• proverbialism
• proverbialisms
• proverbialist
• proverbialists
• proverbialize
• proverbialized
• proverbializes
• proverbializing
• proverbially
• proverbing
• proverbs
• provers
• proves
• proviant
• proviants