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From Citizendium, the Citizens' Compendium

Base might refer to:

• Base (algebra) [r]: Add brief definition or description
• Base (biochemistry) [r]: In the context of nucleic acids it refers specifically to the non-sugar part of nucleotides and can be either a pyrimidine (usually cytosine, thymine, or uracil) or a purine (usually adenine or guanine). [e]
• Base (geometry) [r]: Add brief definition or description
• Base (topology) [r]: Add brief definition or description
• Base (chemistry) [r]: A molecule that can accept protons. [e]
• Base (military) [r]: Add brief definition or description
• Base (baseball) [r]: Any of the four corners in the infield, often marked by a bag or plate. [e]