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Use "observationalist" in a sentence
"There are some promising new names, such as laidback Canadian Pat Burtscher or geezerish observationalist Matt Rudge, but there's also a lot of fairly identical stand-up."
"You are the great ELT observationalist…..and the comedian, too!"
"For an answer see Popper's Wikipedia entry; "Popper is perhaps best known for repudiating the classical observationalist-inductivist account of scientific method by advancing empirical falsifiability as the criterion for distinguishing scientific theory from non-science"."