Looking Up a Word in The WWWebster Dictionary and Thesaurus is very easy.

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You can search for any boldface term. In the dictionary, that includes main entries, inflected forms (e.g., plurals, past tense forms), variant spellings, run-on entries (e.g., homographs with a different part of speech or phrases derived from the main entry), and entries that can be found in the Abbreviations, Foreign Words and Phrases, Biographical Names, and Geographical Names sections of the print dictionary.