From portion +‎ -ist.

portionist (plural portionists)

1. One of the incumbents of a benefice that has two or more rectors or vicars.
2. (historical) A scholar at Merton College, Oxford, England, who has a certain academical allowance or portion.
   • 1867, Orby Shipley, The Church and the World:

     Curates would in fact become Portionists and Incumbents , with a legal status and an independent position within the limit of their appointed jurisdiction

• (scholar): postmaster

• “portionist”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

• trois point