(used of persons or artifacts) marked by independence and creativity in thought or action; "an imaginative use of material"; "the invention of the knitting frame by another ingenious English clergyman"- Lewis Mumford; "an ingenious device"; "had an inventive turn of mind"; "inventive ceramics"
being or characterized by concepts or their formation; "conceptual discussions"; "the schizophrenic loses ability to abstract or do conceptual thinking"; "sex is a notional category, gender is a grammatical category"