Definition of intervention noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Learn the meaning and usage of the word intervention in different contexts, such as politics, economics, medicine, and psychology. Find synonyms, translations, and related terms for intervention in various languages and dictionaries. Learn the meaning of intervention as a noun, with different senses related to politics, psychology, economics, and business. Find synonyms, pronunciation, and usage examples of intervention in British and American English. 2. in the nursing interventions classification, a nursing intervention defined as use of short-term counseling to help the patient cope with a crisis and resume a state of functioning comparable to or better than the pre-crisis state.