The increase of a Sime's selyn consumption to increase strength, speed or heat production by using up more selyn. In Mahogany Trinrose, Ercy learned how to use all ten levels of augmentation by practicing rock-throwing and catching with Uncle Sels. In The Channel's Exemption, Yone Farris similarly used Level Ten to push away a falling tree using up 100 times as much selyn as normal, but he was also able to use his Endowed abilities of psychokinesis to slow its fall first.
(Source: Index card file. House of Zeor) "Any sime can call up the strength of ten Gens" ---- Hugh Fall harvesting time, simes prefer to work under augmentation than to hire more help --- but consumes huge amounts of selyn. Can double a renSime's Kill rate --- hence resorting to the black market (unlicensed raiders), or using Gens caught in spring and fed all summer. Ordinary simes relish augmentation --- Pen ration doesn't allow him to operate at full efficiency very often. Klyd says it is perhaps similar to entran. Simes willl go to black market or raiding on their own if they can.
Messenger uses a "tenth-degree augmentation" on Klyd.
(Source: Index card file. The Channel's Exemption - http://www.simegen.com/sgfandom/rimonslibrary/ce.html) Yone "strengthens his body" by consuming selyn at 100 times his basal metabolic rate --- this is a "tenth level augmentation." He apparently can not maintain this rate for more than a few seconds.
(Source: Index card file. Sime Surgeon http://www.simegen.com/sgfandom/rimonslibrary/surgeon/SURGEON1.html) The ability to boost selyn consumption rate increases sime speed or strength. "Luxurious stretching" of the sime's systems, and hence very enjoyable.