Ad vitam aeternam - To eternal life (for the duration of a person's life)
Addenda et corrigenda - To be added and corrected (Grammatical term - Added to the end of a book so that it will be fixed in the next edition)
Addictio bonorum libertatum servandorum causa - Property exchanged to gain freedom (Legal term - When a master died, the slaves could obtain the property with the condition that they pay all the creditors)
Adeamus ad montem fodere putas cum porribus nostrum - We are going to the mountain to plant potatoes with our hoe
Adeo acriter nostri milites pugnaverunt ut hostes superarent - Our soldiers fought with much determination and overcame to the enemy
Adeo fessus pervenit ut ceciderit et humi iaceret - So tired he arrived that he fell humiliated and he stayed laying on the earth
Adeste fideles - Come faithful (Ecclesiastical term)
Adhaesit pavimento anima mea - My soul is glued to the pavement (Dante, The Divine Comedy)
Adhuc sub iudice lis est - The dispute is still before the judge (Horace - Legal term - Ars poetica)
Aditio a die - Adition to date (Legal term - Condition in which the buyer accepts termination of the sale, if the seller finds a better offer within the deadline stated in the contract)
Aditio haereditatis - Addition of inheritance (Legal term)
Aditio in diem - Adition to date (Legal term - Condition in which the buyer accepts termination of the sale, if the seller finds a better offer within the deadline stated in the contract)
Adjuctorium nostrum in nomine domini qui fecit caellum et terrram - Our help is the name of the Lord, who made heaven and earth (Vulgate - Psalm 121:2)
Admissio proter non usum - Admission by lack of use (Legal term - voluntary servitude is ended by non-use)
Adorote devote latens deitas - Thee we adore, O hidden God thee (Ecclesiastical term - One of Hymns of Saint Thomas Aquinas)
Adsum - I am present (Used as a response on a roll call)
Adsumus custodes pacis - I assume custody of the peace (Motto the Spanish Air Combat Command)
Adveniat Regnum Tuum - (Ecclesiastical term - part of "Our Father")
Adversus solem ne loquitor - Do not talk against the sun (Do not waste time arguing the obvious)
Advocati non ultra quam litium poscit utilitas in licentiam conviciandit et malidicendi temeritati prorrumpant - Lawyers should not employ reckless insults and curses, not having to do with the utility of the Process (Legal term)
Advocatorum error litigatoribus non noceat - An error by the defenders can not harm litigants (Legal term - Codex Iustiniani 2.9.3)
Advocatus Diaboli - Devil's Advocate (Ecclesiastical term - Official title given by the Catholic church to the person who prepares the arguments against the sanctification of a candidate)
Aedificare novae mundi - Building a new world
Aediles plebei - Custodian of the people (In ancient Rome, auxiliary officers in charge of minor legal issues)