Ult, Inst, and Prox

Ultimo, Instant, and Proximo:

Ultimo means last month. Together with instant (the current month) and proximo (next month) it’s an example of an outdated commercial language.

Few businessmen would today begin a letter “With reference to yours of the 14th ultimo”, or “yours of the 23rd instant”, or “Please attend this office for interview on the 11th proximo”, but it was once standard and taught in the best books.

Ultimo | World Wide Words http://www.worldwidewords.org/weirdwords/ww-ult2.htm

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