- conventio – assembly, covenant
- foederis – agreement, compact, covenant, law
- foedus – agreement, alliance, compact, covenant, law
- legis – agreement, covenant, law, statute
- lex – agreement, covenant, law, statute
- paciscor – covenant, deal, pact, to barter, to make a bargain or agreement, to make an agreement
- pactum – agreement, contract, covenant, pact, treaty
- cessante ratione legis cessat ipsa lex – when the reason for the law ceases, the law itself ceases
- de minimis non curat lex – The law does not bother with the smallest things.
- dura lex sed lex – [the] law [is] harsh, but [it is the] law
- legio patria nostra – The Legion is our fatherland
- lex artis – law of the skill
- lex dei vitae lampas – the law of God is the lamp of life
- lex ferenda – the law that should be borne
- lex hac edictali – the law here proclaims
- lex in casu – law in the event
- lex lata – the law that has been borne
- lex loci – law of the place
- lex non scripta – law that has not been written
- lex orandi, lex credendi – the law of prayer is the law of faith
- lex parsimoniae – law of succinctness
- lex rex – the law [is] king
- lex scripta – written law
- lex talionis – the law of retaliation
- lex tempus – time is the law
- lux et lex – light and law
- natura non facit saltum ita nec lex – nature does not make a leap, thus neither does the law
- salus populi suprema lex esto – the welfare of the people is to be the highest law
- sine poena nulla lex – Without penalty, there is no law