Analyzing molecules by mass fragmentation.

Detailed specifications for product design.

(film, literature) A screenplay for a movie that is written on spec and then purchased or sold on the open market, as opposed to one commissioned by a studio or production company.

Military specifications; standard for quality.

Work done without guaranteed payment.

Rate for specific, specialized tasks.

Ratio of specifications to performance.

A home that is built by or for a homebuilder according to their specifications without a purchase order; it is instead built on spec.

ATA Spec 100''' and iSpec 2200''' are information standards for aviation maintenance and flight operations published by Airlines for America (formerly Air Transport Association).

, officially abbreviated as , is a Japanese adult visual novel developed by Madosoft and was released for Windows on April 28, 2016.