1. The eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
   - Precambrian, Precambrian eon, Precambrian aeon

Type of: aeon, eon

• take arms
• take back
• take care
• take chances
• take charge
• take control
• take effect
• take exception
• take fire
• take five
• take flight
• take for
• take for granted
• take form
• take heart
• take heed
• polar hare
• polar opposition
• polar region
• polar star
• polar zone
• polarimeter
• polarimetry
• Polaris
• polarisable