Keyword definition, a word that serves as a key, as to the meaning of another word, a sentence, passage, or the like. See more..A word that serves as a key, as to the meaning of another word, a sentence, passage, or the like. a word used to encipher or decipher a cryptogram, as a pattern for a transposition procedure or the basis for a complex substitution. a word used to classify or organize digital .Keywords are words or phrases that describe content. For example, a photographer may use a program like Extensis Portfolio or Apple iPhoto to tag his nature photos with words such as “nature,” “trees,” “flowers,” “landscape,” etc. Keywords can also describe the content of a Web .Keyword definition The definition of a keyword is a significant word, or a word used to find information when researching. noun When you are looking for .A keyword is a word or phrase that is associated with a particular document or that describes the contents of a particular document, for example, in Internet searches. Users therefore can search by title, by author, by subject, and often by keyword..Define Keywords. Keywords synonyms, Keywords pronunciation, Keywords translation, English dictionary definition of Keywords. also key word n. . A word that .Define keyword. keyword synonyms, keyword pronunciation, keyword translation, English dictionary definition of keyword. also key word n. . A word that serves .