auditor

plural auditors · alternative obsolete auditour

1. One who audits bookkeeping accounts.
2. In many jurisdictions, an elected or appointed public official in charge of the public accounts; a comptroller.
3. One who audits an academic course; who attends the lectures but does not earn academic credit.
4. rareOne who listens, typically as a member of an audience.

   Thus (as you will see with half an eye, my wise little auditors) these good old dames had fallen into a strange perplexity.

   1851 June–July (date written), Nathaniel Hawthorne, “The Gorgon’s Head”, in A Wonder-Book for Girls and Boys, Boston, Mass.: Ticknor, Reed, and Fields, published November 1851 (indicated as 1852), →OCLC, page 32

   3 more examples

   There is another of better notice, and whispered through the world with some attention; credulous and vulgar auditors readily believing it, and more judicious and distinctive heads not altogether rejecting it.

   1650, Thomas Browne, Pseudodoxia Epidemica: […], 2nd edition, London: […] A[braham] Miller, for Edw[ard] Dod and Nath[aniel] Ekins, […], →OCLC

   Sampson's tongue was still flying with rapidity, as if his auditors had not been void of a number, while Mr. Alboni and Natalie were holding a consultation aside.

   1859, Ferna Vale, Natalie; or, A Gem Among the Sea-Weeds

   As we crossed the hall the telephone-bell rang, and we were the involuntary auditors of Professor Challenger's end of the ensuing dialogue.

   1913, Arthur Conan Doyle, “(please specify the page)”, in The Poison Belt […], London; New York, N.Y.: Hodder and Stoughton, →OCLC

5. ScientologyOne trained to perform spiritual guidance procedures.