noun Mathematics.
the cardinal number of the set of all positive integers; the smallest transfinite cardinal number.
Also called aleph-zero [ah-lif-zeer-oh] .

1905–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aleph-null or aleph-zero
א0 the smallest infinite cardinal number; the cardinal number of the set of positive integers
aleph-zero or aleph-zero

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
aleph-null   (ä'lěf-nŭl')  Pronunciation Key 
The first of the transfinite cardinal numbers, corresponding to the number of elements in the set of positive integers.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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