aleph-null

[ ah-lif-nuhl ]

/ ˈɑ lɪfˈnʌl /

Save This Word!

noun Mathematics.

the cardinal number of the set of all positive integers; the smallest transfinite cardinal number.

QUIZ

CAN YOU ANSWER THESE COMMON GRAMMAR DEBATES?

There are grammar debates that never die; and the ones highlighted in the questions in this quiz are sure to rile everyone up once again. Do you know how to answer the questions that cause some of the greatest grammar debates?

Question 1 of 7

Which sentence is correct?

His boss, whom he admires, is waiting to meet with him about the big project.

His boss, who he admires, is waiting to meet with him about the big project.

TAKE THE QUIZ TO FIND OUT

Also called a·leph-ze·ro

[ah-lif-zeer-oh]. /ˈɑ lɪfˈzɪər oʊ/.

Origin of aleph-null

First recorded in 1905–10

Words nearby aleph-null

Alençon lace, Alene, leopard cannot change its spots, a, aleph, aleph-bet, aleph-null, Aleppo, Aleppo gall, Aleppo pine, alerce, alerion

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

British Dictionary definitions for aleph-null

aleph-null

aleph-zero

noun

the smallest infinite cardinal number; the cardinal number of the set of positive integersSymbol: א 0

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for aleph-null

aleph-null

[ ä′lĕf-nŭl′ ]

The first of the transfinite cardinal numbers, corresponding to the number of elements in the set of positive integers.