upper boundary
upper boundary · upper boundaries
The most ancient time encompassed by a given period of timeThe most ancient time encompassed by a given period of time.
Meaning
2 sensesThe most ancient time encompassed by a given period of time.
The most recent time encompassed by a given geological period.
Forms
plural: upper boundaries| Singular | upper boundary |
|---|---|
| Plural | upper boundaries |
regular
Word family
1 related wordsRelatedlower boundary