special development area 
(also special area)
noun
(In the UK) a district for which special economic provision is made in legislation.
- unmistakability
- unmistakable
- unmistakableness
- unmistakably
- unmistakeable
- unmistaken
- unmistakingly
- unmistrustful
- unmistrusting
- unmitigable
- unmitigably
- unmitigated
- unmitigatedly
- unmitred
- unmittened
- unmix
- unmixable
- unmixed
- unmixed blessing
- unmixedly
- unmixedness
- unmixing
- unmoaned
- unmobilised
- unmobilized