Etymology
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planner (n.)

1716, "one who plans, a deviser or arranger," agent noun from plan (v.). Betjeman coined the derogatory variant planster in 1945. Meaning "book or device that enables one to plan" is from 1971.

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Definitions of planner

planner (n.)
a person who makes plans;
Synonyms: contriver / deviser
planner (n.)
a notebook for recording appointments and things to be done, etc.;
From wordnet.princeton.edu