Wikipedia licenses most of its content under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
What that basically means is that you are free to reproduce their content as long as you give credit to Wikipedia as the source (the attribution part of the license) and you have to allow others to use your modified content too (the share alike part of the license).
This is Wikipedia’s copyright and licensing page: https://en.m.wikipedia.org/wiki/Wikipedia:Copyrights
This is the Creative Commons Attribution-ShareAlike 3.0 Unported License: https://en.m.wikipedia.org/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License
Here’s the actual text of Attribution and ShareAlike parts of the license:
Attribution—You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work.)
Share Alike—If you alter, transform, or build upon this work, you may distribute the resulting work only under the same, similar or a compatible license.
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