Laws with broad **Definitions** of rape are like laws making 55 mile per hour speed limits for men and no speed limits for women.

— p. 317. (Part III: Government as substitute husband)

If we wish to express our ideas in terms of the concepts synthetic and analytic, we would have to point out that these concepts are applicable only to sentences that can be either true of false, and not to **Definitions**. The mathematical axioms are therefore neither synthetic nor analytic, but **Definitions**. ...Hence the question of whether axioms are a priori becomes pointless since they are arbitrary.

— Hans Reichenbach, in 'The Philosophy of Space and Time (1928), as translated by Maria Reichenbach (1957), § 14