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alt.
Alt key
alt rock
Alta.
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Altai Mountains
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Altamonte Springs
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alternation

al·ter·na·tion [ àwltər náysh'n ] (plural al·ter·na·tions)


noun 
Definition:
 
1. process of alternating: a process of change in which one thing follows, or is made to follow, another in a regular repeated pattern

2. logic proposition: a proposition of the form "p or q," that is, either sentence "p" is true or sentence "q" is true

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