STC
Definition
Subject to contract: A common abbreviation in UK real estate indicating that a property sale agreement is provisional and not yet legally binding.
Sound Transmission Class: A single-number rating system used in acoustics to measure how well a building partition reduces airborne sound transmission.
Supplemental Type Certificate: In aviation, an FAA-approved modification to an existing type-certified aircraft, engine, or propeller.
Sorry to creep: Internet slang, particularly on social media like Facebook, used when commenting on or referencing old photos or posts.
Examples
The estate agent's sign proudly declared 'Sold STC' – because nothing says 'dream home' like a deal that's still dangling by a contract thread.
My apartment's walls have a dismal STC rating; I know exactly when the upstairs neighbor microwaves popcorn.
After bolting on that STC-approved turbocharger, his Piper now flies like it's late for a date.
Stc, but that 2009 beach pic of yours is still serving looks.