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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.
Pages in category "Time"
The following 121 pages are in this category, out of 121 total. This list may not reflect recent changes (learn more).