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Children's Dictionary
experiment to perform an experiment; to explore by trying different things. [1/2 definitions]
experimental being an experiment or like an experiment. [1/2 definitions]
laboratory a place for science students to experiment, make observations, and practice scientific techniques, or a place equipped with special technology for various students to use as an aid to learning. [1/3 definitions]
trial done by way of a trial or experiment. [1/5 definitions]