Quaternary
/ˈkwɑ.tɚˌnɛɹ.i/
Meaning 1
the latest geological period in Earth's history
“Fossils from the Quaternary provide important clues.”Add to my deck
Meaning 2
The most recent geological time period.
“We found fossils from the Quaternary period in the cave.”Add to my deck
Meaning 3
Relating to four parts or groups.
“The chemist mixed a quaternary compound using four elements.”Add to my deck
