1. (verb) make formal or official

• formalise

2. (verb) declare or make legally valid

• formalise
• validate

1. (verb) make formal or official

• adjudge
• declare
• hold

2. (verb) declare or make legally valid

• authorise
• authorize
• clear
• pass

1. (verb) make formal or official

• ritualise
• ritualize

2. (verb) declare or make legally valid

• co-sign
• cosign
• probate
• ratify
• sign

1. (verb) declare or make legally valid

• annul
• avoid
• invalidate
• nullify
• quash
• void

1. (verb) make formal or official

• formalisation
• formalisation
• formalization
• formalization

2. (verb) declare or make legally valid

• formalisation
• formalisation
• formalization
• formalization