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Time is a measure of duration. It can mark change by operational definition, or by other technologies. By the 20th century, Albert Einstein came to regard time as a fourth dimension, along with space, within a spacetime.
This category has the following 28 subcategories, out of 28 total.
- ► Time in astronomy (1 C, 43 P)
- ► Horology (7 C, 53 P)
- ► Lists by time (3 C)
- ► Time management (1 C, 33 P)
- ► Units of time (10 C, 90 P)
- ► Winter time (10 P)
Pages in category "Time"
The following 52 pages are in this category, out of 52 total. This list may not reflect recent changes (learn more).