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Definition of Eighteen
1. Adjective. Being one more than seventeen.
2. Noun. The cardinal number that is the sum of seventeen and one.
Definition of Eighteen
1. a. Eight and ten; as, eighteen pounds.
2. n. The number greater by a unit than seventeen; eighteen units or objects.
Definition of Eighteen
1. Cardinal numeral. The cardinal number occurring after seventeen and before nineteen, represented in Roman numerals as XVIII and in Arabic numerals as 18. ¹
¹ Source: wiktionary.com
Definition of Eighteen
1. a number [n -S]