a. [Formed as next + -(I)AL.] = next.

1

1754.  A. Murphy, Gray’s-Inn Jrnl., No. 98, ¶ 6. It is ushered in with a stentorial Voice enough to crack the Ceiling.

2

1846.  Blackw. Mag., LX. 756. In the course of his stentorial and senatorial career he [John Bright] has more than once [etc.].

3