Definition of "mech"

But I reprogrammed the recognition codes, and they won't treat him as Roubor Transic, nor will they obey any order he gives them. He's Mr. X to the mechs, a casual human to be taken care of just as well as possible, but never, never released.

1999, Analog Science Fiction & Fact - Volume 119, page 55

He particularly liked the box full of "companions," small, hand-held mechs with advanced AI functions, programmed as individual advice and information systems.

2001, Robert I. Katz, Edward Maret: A Novel of the Future, page 100

She grew up in Lower Manhattan, suffering the impeccably programmed attentions of the nanny mechs that did the work her mother and father couldn't be bothered with.

2006, Lou Anders, Futureshocks, page 75

After a round of hugs and kisses, they headed to the lounge where Genie met them at the door and escorted them to the new VIP section followed by a mech that took their drink orders.

2019, Ron S. Nolan, Met Chron New-Humans

Yes, Switchitis. It's a highly contagious disease which can affect all propeller mechs. This disease can be costly, but usually not to the mechs. They're just the carriers. The people most affected by this disease are the flightcrews – those fearless adventurers who go flying around in machines that you mechs have worked on.

1979, Daved V. Arel, “Switchitis”, in Mech, page 6

To fit a braze-on front mech without breaking the chain, remove the nut and bolt from the chain cage, as shown.

2011, Fred Milson, Complete Bike Maintenance, MVP Books, page 88

Campagnolo made one more giant step forward when the company developed the first parallelogram rear mechanism—the Gran Sport—in 1951. Its parallelogram action and double jockey wheels are how all rear mechanisms (or rear mechs for short) operate today.

2015, Chris Boardman, The Biography of the Modern Bike: The Ultimate History of Bike Design, Hachette, page 54