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Related to perpendicular: perpendicular slope
normal(Regular), adjective according to rule, common, commonplace, conforming, conventional, customary, established, everyday, habitual, natural, orderly, ordinary, representative, routine, standard, standardized, true to form, typical, unexceptional, unvarying, usual
Associated concepts: normal conditions, normal course of business, normal use
normal(Sane), adjective fit, logical, lucid, mentally sound, of sound judgment, rational, reasonable, sensible, sound, temperate
See also: accustomed, average, common, conventional, current, customary, exemplary, familiar, habitual, mediocre, natural, ordinary, prevailing, prevalent, regular, routine, sane, standard, typical, usual