Meaning of SPEC in English

SPEC

spec /spek/ BrE AmE noun informal

[ Sense 1: Date: 1900-2000 ; Origin: specification ]

[ Sense 2: Date: 1800-1900 ; Origin: speculation ]

[ Sense 3: Date: 1800-1900 ; Origin: spectacles ]

1 . [countable usually plural] a detailed instruction about how a building, car, piece of equipment etc should be made SYN specification :

the specs for the company’s new video games console

2 . on spec if you do something on spec, you do it without being sure that you will get what you are hoping for:

I sent in an application on spec.

3 . specs [plural] glasses that help you see

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.