n. — Prairies, Social customs
a gift of money given at a wedding or wedding anniversary.
Type: 3. Semantic Change — OED-3 lists presentation in its meaning of "a present, gift, donation" as obsolete, with the latest attestation coming from the 18th century. However, in the Canadian Prairies, that meaning is still used, and it appears that it was used at least as early as the turn of century. Although presentation may refer to the act of handing over a gift, which is a common current meaning (see the 1900 quotation), note that in the quotations below starting in 1907 the term refers to the gift itself (see, e.g. the 1951 and 1983 quotations). By the 1950s, the term had acquired the primary meaning of the 'monetary gift' itself in the Prairie wedding context, and in the 1983 quotation, the term is cited as a marker Canadian Prairie usage.
See also COD-2, s.v. "presentation" (7.b), which is marked "Cdn (Prairies)".