eighteen has definitions from the field of mathematics
1
[ adjective ] being one more than seventeen

Synonyms

18 xviii

Used in print

(The Sun, [Baltimore],...)

The Orioles tonight retained the distinction of being the only winless team among the eighteen Major-League_clubs as they dropped their sixth straight spring exhibition decision , this one to the Kansas_City Athletics by a score of 5 to 3 .

(Stephen Longstreet, Eagles Where I Walk....)

When Peter had reached his majority at eighteen ?

Related terms

cardinal

2
[ noun ] (mathematics) the cardinal number that is the sum of seventeen and one

Synonyms

XVIII 18

Related terms

large_integer

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