Definition of reference noun in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Reference refers to the act of mentioning or alluding to something, or a source of information such as a book or person that provides proof or clarification. e.g., She made several references to her notes during the presentation. Learn the meaning of reference as a noun, verb, and preposition, with synonyms, example sentences, and word history. Find out how to use reference in different contexts, such as academic writing, law, philosophy, and commerce. If you are writing a report for school, you are probably relying on a few references , or sources, for information. Or, if you are applying for a job, you may count on a reference from a previous boss to help you get the job.