planner Syllabification: (plan·ner)Pronunciation: /ˈplanər/Translate planner | into French | into German | into Italian | into Spanish Definition of planner noun 1a person who makes plans. a person who controls or plans urban development:city planners 2 [usually with modifier] a list or chart with information that is an aid to planning:my day plannerplanner in other Oxford dictionaries Definition of planner in the British & World English dictionary