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adj.
being of the nature of a notion or concept; "a plan abstract and conceptional"; "to improve notional comprehension"; "a notional response to the question"
adj.
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"
adj.
constituting or existing only in the form of an idea or mental image or conception; "a poem or essay may be typical of its period in idea or ideal content"