spec (specs plural )
1 n-plural Someone's specs are their glasses.
INFORMAL ...a young businessman in his specs and suit.
2 n-count The spec for something, especially a machine or vehicle, is its design and the features included in it.
INFORMAL
(=specification)
The standard spec includes stainless steel holding tanks.
3 If you do something on spec, you do it hoping to get something that you want, but without being asked or without being certain to get it.
INFORMAL
♦
on spec phrase
When searching for a job Adrian favours networking and writing letters on spec.