fortification (n.)
- abatis
- affirmation
- attestation
- authentication
- backing
- bank
- banquette
- barbican
- barricade
- barrier
- bastion
- battlement
- breastwork
- bulwark
- buttressing
- certification
- cheval-de-frise
- confirmation
- corroboration
- curtain
- dike
- documentation
- drawbridge
- earthwork
- enclosure
- enrichment
- entanglement
- escarp
- escarpment
- fence
- fieldwork
- hardening
- invigoration
- loophole
- lunette
- machicolation
- mantelet
- merlon
- mound
- outwork
- palisade
- parapet
- portcullis
- proof
- proving
- rampart
- ratification
- redoubt
- refreshment
- reinforcement
- restoration
- revivification
- scarp
- sconce
- stockade
- strengthening
- substantiation
- support
- tempering
- validation
- verification
- work
