instrumental
/ɪnstɹəˈmɛntəl/ adjective C1- Essential or central; of great importance or relevance. · He was instrumental in conducting the business.
- Serving as an instrument, medium, means, or agency.
- Pertaining to, made by, or prepared for an instrument, especially a musical instrument (rather than the human voice). · instrumental music· an instrumental part
- Of or relating to a case expressing means or agency, generally corresponding to the English use of prepositions such as by, with, through, or by means of with the objective case. · the instrumental case
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The hippocampus, a seahorse-shaped structure nestled deep within the brain, plays an instrumental role in our spatial memory and navigation.
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