base
/beɪs/ noun [C]Definition
BOTTOM › the bottom part of something, or the part something rests on: It's quite easy to fasten the monitor onto the base. I felt a sharp pain at the base of my thumb.
MAIN PART › the most important part of something, from which other things can develop: a solid economic base
PLACE › the main place where a person lives or works, or from where they do things: Keswick is an excellent base for exploring the Lake District.
ARMY › a place where people in the army or navy live and work: an American Air Force base
ORGANIZATION › the place where the main work of an organization is done: The company's European base is in Frankfurt.
SUBSTANCE › the main substance in a mixture: paints with an oil base
BASEBALL › one of the four places in baseball that a player must run to in order to win a point
CHEMISTRY › a chemical substance with a pH (= measure of how acid something is)of more than 7
MATHS › a number that is used as the most important unit in a system of counting: The binary system of counting uses base 2.
(Definition of base noun from the Cambridge Learner's Dictionary
© Cambridge University Press)
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