Abelian group

World English Dictionary
Abelian group (əˈbiːlɪən)
 
n
a group the defined binary operation of which is commutative: if a and b are members of an Abelian group then ab = ba
 
[C19: named after Niels Henrik Abel (1802--29), Norwegian mathematician]

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Abelian group is always a great word to know.
So is interrobang. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
American Heritage
Science Dictionary
abelian group also Abelian group   (ə-bē'lē-ən)  Pronunciation Key 
See commutative group.
The American Heritage® Science Dictionary
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