formal for "perk", viz. a special right or privilege"
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Uses:
“Is this a full meeting?” asked the Prince.
“Middling,” said the President. “By the way,” he added, “if you have any money, it is usual to offer some champagne. It keeps up a good spirit, and is one of my own little perquisites.”
Robert Louis Stevenson. The Suicide Club
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Sunshine, streaming into his bedroom through the open window, woke Garnet next day as distant clocks were striking eight. It was a lovely morning, cool and fresh. The grass of the lawn, wet with dew, sparkled in the sun. A thrush, who knew all about early birds and their perquisites, was filling in the time before the arrival of the worm with a song or two as he sat in the bushes. In the ivy a colony of sparrows were opening the day well with a little brisk fighting. On the gravel in front of the house lay the mongrel Bob, blinking lazily.
P. G. Wodehouse. Love Among the Chickens A Story of the Haps and Mishaps on an English Chicken Farm (1909)
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France had a burgeoning market for grease, animal fat, and animal skins, and it was one of the perquisites of a chef to sell these kitchen byproducts and pocket the proceeds. And that's exactly what James did.
Thomas J. Craughwell. Thomas Jefferson's Crème Brûlée, p.114 (2012)