a. rare. [f. SUPPOSITION + -ARY1.] = SUPPOSITIONAL.

1

1808.  J. Webster, Nat. Philos., 152. This … knowledge is more vague and suppositionary.

2

1812.  Shelley, Lett., in Dowden, Life (1887), I. 282. The manner in which you have reproved my suppositionary errors.

3