| Part of Speech | Definition | |
| Noun | 1. Approximately the last 63 million years.[Wordnet]. | |
Source: WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. | Top | |
Common Expressions: Age of Mammals
| Expressions | Definition | ||
| Age of Mammals | Approximately the last 63 million years. Source: Wordnet 3.0 Copyright © 2006 by Princeton University. All rights reserved. | ||
Source: compiled by the editor from various references; see credits. | Top | ||
