nationwide /ˌneɪ.ʃənˈwaɪd/adjective 1adverb 1 adjective1 •Extending throughout an entire nation.There was a nationwide search on for the bankrobbers. adverb1 •Throughout a nation.…Toote became the principal Black surrogate (highest “rank” in the Reagan campaign operation), booking Reagan for appearances before Black organizations and traveling nationwide in his behalf. — 1980