rational

[1]	rational number

adj.

[1]	well-balanced , sane , sound , normal , reasonable , reasoning , logical , ratiocinative , clear-headed , clear-eyed , sober , of sound mind , (Colloq) all there
[2]	discriminating , intelligent , thinking , enlightened , prudent , wise , knowledgeable , informed
[3]	sensible , intellectual , noetic , common-sense , commonsensical , practical , pragmatic , down-to-earth , everyday , acceptable , reasonable , logical