Semis sex uncias habet.

Semis is the subject of the sentence. It is in the nominative singular.

So the basic structure is:

• semis = the subject
• sex uncias = the object
• habet = the verb

In other words, semis is the thing that has the six ounces.

Because the subject, semis, is singular.

Habet means he/she/it has or simply has. Here it goes with semis, which is one single thing, so Latin uses the third person singular verb form.

If the subject were plural, the verb would also be plural.

This is a very common thing learners notice. In this kind of numerical or fractional expression, Latin often says that something has a certain number of unciae.

So instead of saying something like a half is six twelfths, Latin can express it as:

• Semis sex uncias habet = A half has six twelfths/ounces

This is a natural Latin way to describe how much a fraction contains.

Because sex is an indeclinable numeral. That means its form stays the same no matter what case the noun around it is in.

So you get:

• sex unciae
• sex uncias
• sex unciarum

and sex stays sex each time.

This is normal for many Latin numbers.

Because uncias is the direct object of habet.

The sentence is literally saying that semis has six unciae, so the thing being had is the direct object, and direct objects normally go in the accusative.

Why plural? Because there are six of them.

So:

• singular nominative: uncia
• plural nominative: unciae
• plural accusative: uncias

In this context, an uncia is not just an English-style ounce in the modern sense. In Roman usage, uncia is a twelfth part of a whole, especially of an as or another standard unit.

So sex unciae means six twelfths.

That is why semis works here: a half is made up of six twelfths.

Semis is a Latin word for half, especially in old Roman systems of weight, value, and fractions.

Historically, it can refer to:

• half of an as
• more generally, a half-unit

In this sentence, it is being treated as a noun: the half.

So grammatically it behaves like a single subject.

Because Latin has no articles.

English often needs a, an, or the, but Latin usually does not. The reader understands from context whether the sense is:

• a half
• the half
• just half

So Semis sex uncias habet does not need any separate word for a or the.

The word order is normal, but Latin is more flexible than English.

Here we have:

• Semis = subject
• sex uncias = object phrase
• habet = verb

This is a very common Latin pattern, with the verb at the end.

Latin could also rearrange the words for emphasis, for example:

• Sex uncias semis habet
• Semis habet sex uncias

But the original order is straightforward and natural.

Because sex uncias is one unit: six ounces/twelfths.

In Latin, a numeral often stands directly next to the noun it modifies, just as in English:

• six ounces
• sex uncias

Keeping them together makes it easy to see that sex is describing uncias.

You would look it up under habeo, habere, habui, habitum.

Habet is the third person singular present active indicative form.

So:

• habeo = I have
• habes = you have
• habet = he/she/it has

In this sentence, habet means has.