Galericulum calvitium celat.

That is a very good question, because this is exactly the kind of thing that surprises English speakers.

Both galericulum and calvitium are neuter singular nouns of the second declension, and in neuter nouns the nominative singular and accusative singular have the same form. So -um by itself does not tell you whether the noun is the subject or the direct object.

So how do you tell?

• by context
• by meaning
• often by word order

Here, galericulum is understood as the subject and calvitium as the object because a cap/wig hides baldness makes sense, while baldness hides a cap/wig does not. Also, the first noun is often taken as the subject unless something points strongly the other way.

So in this sentence:

• galericulum = subject
• calvitium = direct object

Here galericulum is functioning as the nominative singular, because it is the subject of celat.

Its dictionary form is also galericulum, so this is the form you would normally memorize.

However, as noted above, the form galericulum could also be accusative singular in another sentence, because neuter second-declension nouns have the same form for nominative and accusative singular.

Here calvitium is the accusative singular, because it is the direct object of celat.

The verb celat is transitive, so it takes something being hidden. In this sentence, that thing is calvitium.

Again, because calvitium is neuter singular, its nominative and accusative forms look the same. You identify the case here from the sentence’s meaning and structure.

Celat is the third-person singular present active indicative of celare, meaning to hide or to conceal.

So celat means:

• he hides
• she hides
• it hides
• or more naturally in this sentence, hides

Since the subject is galericulum, which is a neuter singular noun, celat is best understood as it hides.

Grammatically:

• tense: present
• voice: active
• mood: indicative
• person: third
• number: singular

The verb is singular because the subject, galericulum, is singular.

Latin verbs agree with their subject in person and number. Since galericulum is one thing, the verb must also be singular:

• galericulum ... celat = the cap/wig hides

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

Classical Latin does not have definite and indefinite articles like English the and a/an.

So galericulum can mean:

• a cap
• the cap
• a little cap
• the little cap
• depending on context

Likewise calvitium can mean baldness without any article at all, since abstract nouns often do not need one in English either.

When translating Latin into English, you add a or the only if the context calls for it.

Yes, you could change the word order, because Latin word order is much freer than English word order.

So these are all possible Latin arrangements:

• Galericulum calvitium celat
• Calvitium galericulum celat
• Celat galericulum calvitium

However, the meaning may become less immediately clear, especially in a sentence like this where both nouns have identical nominative/accusative forms. The original order is helpful because it naturally encourages the reader to take galericulum as the subject and calvitium as the object.

So the original sentence is a sensible, learner-friendly order.

Yes, it looks like a diminutive form.

The ending -culum often appears in diminutives or words with a small or sometimes more specialized sense. So galericulum can suggest something like a small cap, skullcap, or in some contexts a wig.

A learner should not assume every -culum word is transparently diminutive in meaning every time, but it is useful to notice the pattern.

Calvitium is an abstract noun meaning baldness.

That means it names a condition or quality rather than a concrete object. English does the same thing with words like:

• wisdom
• beauty
• poverty
• baldness

Because it is abstract, it often appears in the singular.

A good way to memorize them is:

• galericulum, galericuli, n.
• calvitium, calvitii, n.
• celo, celare, celavi, celatum

That tells you:

• the nouns are second-declension neuter
• the verb is a first-conjugation verb

So when you see celat, you should learn to connect it back to celo, celare.

Latin present tense is often broader than a single English form.

Celat can be translated as:

• hides
• is hiding
• sometimes even does hide

In a simple sentence like this, English usually prefers hides:

A cap/wig hides baldness.

That is the most straightforward match.

In reconstructed Classical pronunciation, a helpful approximate guide is:

ga-le-RI-cu-lum kal-WI-ti-um KE-lat

A few useful points:

• g is always hard, as in go
• c is always hard, as in cat
• v is pronounced like English w
• stress usually falls according to Latin stress rules; in these words, you can think of the stress roughly as galericulum, calvitium, celat

So celat begins with a hard k sound, not a soft s sound.

Yes. Celare can mean to hide, to conceal, or to keep from being seen/noticed.

So depending on context, you might understand this sentence as:

• A cap hides baldness
• A cap conceals baldness
• A cap covers up baldness

The basic idea is the same: calvitium is being kept out of sight.