40s
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| Millennia: | 1st millennium |
| Centuries: | 1st century BC - 1st century - 2nd century |
| Decades: | 10s 20s 30s - 40s - 50s 60s 70s |
| Years: | 40 41 42 43 44 45 46 47 48 49 |
| Categories: | Births - Deaths - Architecture Establishments - Disestablishments |
- Notes: Sometimes the '40s is used as shorthand for the 1940s, the 1840s, or other such decades in various centuries. In Black American vernacular, '40s' may also refer to forty ounce bottles of malt liquor.
