Meaning of “pure” - Learner’s Dictionary

pure

adjective uk us /pjʊər/
NOT MIXED

B1 A pure substance is not mixed with anything else:

pure gold
pure wool
EMPHASIS [ always before noun ]

B2 used to emphasize that a feeling, quality, or state is completely and only that thing:

Her face had a look of pure delight.
CLEAN

B1 clean and healthy:

pure air/water
pure mathematics/physics, etc

the study of mathematics/physics, etc based only on ideas and not on practical use

GOOD

completely good and not having any bad qualities or bad morals

(Definition of “pure” from the Cambridge Learner’s Dictionary © Cambridge University Press)