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EFFICIENT - Synonyms, related words and examples | Cambridge English Thesaurus efficient meaning, definition, what is efficient: if someone or something is efficient, th...: Learn more. Efficient definition: performing or functioning in the best possible manner with the least waste of time and effort; having and using requisite knowledge, skill, and industry; competent; capable.. See examples of EFFICIENT used in a sentence. Effective and efficient are two terms that often get mixed up, but they have different meanings. Being effective means achieving your goal or getting the results you want. It’s about doing the right things—those that lead to success. On the other hand, being efficient is about doing things in the best possible way, with the least waste of time and effort. It’s not just about reaching your goal but doing so in a smart, cost-saving manner. In simple terms, if you’re effective, you’re ...