-n't shortened (enclitic) form of not¹

NT

1. National Theatre (now known as RNT)
2. National Trust
3. New Testament
4. Northern Territory (Aust)
5. Northwest Territories (of Canada)
6. No trumps (cards)

• immobilise
• immobilised
• immobiliser
• immobilisers
• immobilises
• immobilising
• immobilism
• immobilisms
• immobilities
• immobility
• immobilization
• immobilizations
• immobilize
• immobilized
• immobilizer
• immobilizers
• immobilizes
• immobilizing
• immoderacies
• immoderacy
• immoderate
• immoderately
• immoderateness
• immoderatenesses
• immoderation