from The Century Dictionary.
- noun The office or function of a chorister.
Sorry, no etymologies found.
Audley spoke of a choristership for Clement in the clergy - house at Whittingtonia.
The Pillars of the House, V1 Charlotte Mary Yonge 1862
Kalliope was still unfit to be consulted or even informed, and she had been hitherto so entirely the real head and manager of the family that Alexis did not like to make any decision without her; and even the acceptance of the St. Wulstan's choristership for Theodore had been put off for her to make it, look to his outfit, and all that only the woman of the family could do for them.
Beechcroft at Rockstone Charlotte Mary Yonge 1862