Etymology
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experimental (adj.)

mid 15c., "having experience," from experiment (n.) + -al (1). Meaning "based on experiment" is from 1560s. Meaning "for the sake of experiment" is from 1792.

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Definitions of experimental

experimental (adj.)
relating to or based on experiment;
experimental physics
experimental (adj.)
relying on observation or experiment;
experimental results that supported the hypothesis
Synonyms: data-based / observational
experimental (adj.)
of the nature of or undergoing an experiment;
an experimental drug
From wordnet.princeton.edu