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- pronunciation:
- i
an
[or]
i
 n
- features:
- Word Combinations (noun), Word Explorer
| part of speech: |
noun |
| definition 1: |
in geology, the longest division of time, encompassing two or more eras.
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| definition 2: |
an extremely long period of time.
- similar words:
- age
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| related words: |
age, period |
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