One of the mysteries of the English language finally explained.
Adhering to observationalism; practising observational as opposed to theoretical work; (also, more generally) using observation as a principal method of working.
A person who employs observation as a principal method of working (opposed to theoretician, theorist). Also (Philosophy): an adherent of observationalism.
1950s; earliest use found in Mind. From observational + -ist.
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