noun, adjective, verb, spec'd or specked or specced, spec'⋅ing or speck⋅ing or spec⋅cing.| 3. | built, done, bought, etc., as a speculation: the construction of spec houses. |
| 4. | to provide specifications for: Their newest truck was spec'd by a computer. |
| 5. | on spec, made, built, or done with hopes of but no assurance of payment or a sale; without commitment by a client or buyer: ad illustrations done on spec; luxury homes built on spec and sold before completion. |
