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Arian (2)
ariboflavinosis
arid
arid zone
aridisol
Ariel
Aries
arietta
aright
Arikara
ariki
aril
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arithmetic progression

ar·ith·met·ic pro·gres·sion (plural ar·ith·met·ic pro·gres·sions)


noun 
Definition:
 
sequence of numbers: a sequence of numbers in which a constant figure common difference is added to each term to give the next. For example, 3, 8, 13, 18 is an arithmetic progression in which the common difference is 5.

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