Veteranus adeo bene se defendit ut editor ei missionem det.

It means so well or to such a degree well.

• bene is the adverb well
• adeo strengthens it: so, so much, to such a degree

So adeo bene sets up the idea of degree that is completed by ut later in the sentence.

It is a result clause.

The pattern adeo ... ut ... means so ... that .... So the sentence is structured like this:

• Veteranus adeo bene se defendit = the veteran defends himself so well
• ut editor ei missionem det = that the editor grants him release

This is not a purpose clause (in order that). It describes the result of how well he defends himself.

Because Latin normally uses the subjunctive in a result clause.

Here det is the present subjunctive of do, dare. After expressions like adeo, tam, ita, or sic, Latin commonly has ut + subjunctive to show the consequence.

So:

• dat = gives in a simple statement
• det = may give / would give, but here more specifically the normal verb form inside a result clause

English does not always show this difference clearly, but Latin does.

The subject of det is editor.

That is important because the sentence has two different clauses with two different subjects:

• main clause: Veteranus ... defendit → the veteran is the subject
• result clause: editor ... det → the editor is the subject

So the veteran is doing the defending, but the editor is doing the granting.

In ordinary spelling, defendit can mean either he defends or he defended.

So the form is technically ambiguous. In this sentence, it is most naturally understood as present:

• The veteran defends himself so well that ...

One reason is the following det, which fits well with a present main verb in this kind of sentence. If the whole sentence were clearly past, you would often expect something like daret in the subordinate clause instead.

Because se is the reflexive pronoun.

It refers back to the subject of its own clause. Since the veteran is defending himself, Latin uses se:

• se defendit = he defends himself

If it said eum defendit, that would mean he defends him, referring to some other male person.

ei is the correct pronoun here because it means to him, referring to the veteran as the person receiving the discharge.

Also, ei is in the dative case, which is the case normally used for the person who receives something with dare.

Why not sibi?

• sibi is reflexive
• in this clause, the subject is editor
• so sibi would naturally refer back to editor, not to veteranus

That would give the wrong sense: the editor gives a discharge to himself.

missionem is accusative singular, the direct object of det.

With dare, Latin often works like this:

• person receiving = dative → ei
• thing being given = accusative → missionem

As for meaning, missio here is a technical gladiatorial term. It means release, reprieve, or discharge from the fight, not a modern mission in the English sense.

So missionem dare means to grant a reprieve/release.

No. In Roman context, editor means the person who puts on, sponsors, or produces the games.

So it is a cultural false friend for English speakers. It is related to the idea of bringing forth or putting out an event, not editing text.

Not necessarily. By itself, veteranus can certainly mean veteran or experienced man, and in many contexts it can mean a military veteran.

But in this sentence, because of editor and missionem, the context is probably gladiatorial. So veteranus is likely a veteran gladiator rather than an ex-soldier.

Because bene is an adverb, while bonus is an adjective.

Here Latin needs a word modifying the verb defendit, so it uses the adverb:

• bene defendit = he defends well

If you used bonus, that would describe a noun, not the action itself.

Latin word order is more flexible than English word order because the endings show the grammatical relationships.

Still, the order here is very natural:

• Veteranus first: introduces the main topic
• adeo bene before the verb phrase: emphasizes the degree
• ut ... det after that: gives the result
• det at the end: very common placement for a Latin verb, especially in a subordinate clause

So the order is not random, but it is also not as rigid as English.