spec
noun [ C or U ]
/spek/ ukus(US also specs [ plural ]) informal
abbreviation for specification :
Always look at the car's spec before you sign a contract.
high/basic spec The PC with the most basic spec is the cheapest.
How much does it cost to continue retooling a mold when a customer keeps changing design specs?
on spec
taking a chance, without being sure that you will get what you want:
The builders built homes on spec - prior to finding a buyer.