Probably the truth is that they have not; yet even if 'one' has several meanings, the other meanings will be related to the primary meaning (and similarly in the case of the contraries), even if being or unity is not a universal and the same in every instance or is not separable from the particular instances (as in fact it probably is not;
Hala ere, Bata zentzu askotan esaten den arren, gainerako gauzak ere lehenengo batari begira esango dira, eta berdin kontrakoak. [Eta horregatik ] 10) [ "Den-a" edo "Bata" unibertsalak eta gauza guztiekiko gauza bera ez badira-eta seguruenik ez da horrela izango-batzuk bati begira esaten direlako eta beste batzuk, berriz, bata bestearen ondoren ematen direlako dute batasun hori].