Mencionamos la fecha.

Mencionamos can be either:

• present tense: we mention
• preterite: we mentioned

This happens because for regular -ar verbs, the nosotros form is the same in both tenses.

So by itself, Mencionamos la fecha is grammatically ambiguous. Only the context tells you whether it means present or past.

For example:

• Cada vez que hablamos, mencionamos la fecha. = present
• En la reunión, mencionamos la fecha. = past

Spanish often drops subject pronouns when they are not needed.

The ending -amos already tells you the subject is nosotros/nosotras = we.

So:

• Mencionamos la fecha = We mention / We mentioned the date
• Nosotros mencionamos la fecha = also correct, but more explicit

You would add nosotros only if you want emphasis, contrast, or clarity.

For example:

• Nosotros mencionamos la fecha, pero ellos no.
  = We mentioned the date, but they didn’t.

Because fecha is a specific noun here and Spanish normally uses an article in this kind of sentence.

• la fecha = the date
• una fecha = a date

So:

• Mencionamos la fecha = We mentioned the date
• Mencionamos una fecha = We mentioned a date

Also, fecha is a feminine noun, so it takes la, not el.

The noun fecha is grammatically feminine, so it uses feminine words with it:

• la fecha
• una fecha
• esta fecha
• la fecha exacta

A lot of Spanish nouns ending in -a are feminine, and fecha follows that common pattern.

This is grammatical gender, not biological gender.

Yes. Mencionamos la fecha is the most neutral word order, but Spanish can change word order for emphasis.

For example:

• Mencionamos la fecha. = neutral
• La fecha la mencionamos. = more emphasis on the date
• Nosotros mencionamos la fecha. = emphasis on we

Still, for a learner, the basic pattern to remember is:

verb + direct object
Mencionamos + la fecha

Because la fecha is a direct object, and it is not a person.

Spanish uses the personal a mainly with specific people (and sometimes pets or personified beings), for example:

• Vemos a María.
• Llamamos a mi hermano.

But with things, you normally do not use a:

• Mencionamos la fecha.
• Vemos la casa.
• Compramos el libro.

So Mencionamos a la fecha would not be correct here.

In standard Peninsular Spanish, mencionamos is pronounced approximately:

men-thyo-NA-mos

The important point for Spain is the c before i:

• ci is usually pronounced like th in think in most of Spain

So:

• mención sounds roughly like men-THYON
• mencionamos sounds roughly like men-thyo-NA-mos

Also:

• the stress is on -na-: mencioNAmos
• la fecha is roughly la FE-cha

Yes, mencionar is a normal and useful verb meaning to mention.

Possible related verbs are:

• nombrar = to name / to mention
• decir = to say
• hablar de = to talk about

But they are not always interchangeable.

For example:

• Mencionamos la fecha. = We mentioned the date.
• Dijimos la fecha. = We said the date.
• Hablamos de la fecha. = We talked about the date.

So mencionar is the best choice when you mean to refer to something briefly.

The infinitive is mencionar, meaning to mention.

This sentence is built from:

• mencionar → infinitive
• mencionamos → we mention / we mentioned

It is a regular -ar verb, so it follows the normal pattern.

Present tense:

• menciono = I mention
• mencionas = you mention
• menciona = he/she mentions
• mencionamos = we mention
• mencionáis = you all mention
• mencionan = they mention

Yes, it is perfectly natural Spanish.

It sounds like a neutral, standard sentence you might see in:

• a textbook
• a report
• a conversation about what was said
• a meeting summary

Depending on context, native speakers might also say:

• Hemos mencionado la fecha.
• Se mencionó la fecha.
• Hablamos de la fecha.

But Mencionamos la fecha is completely correct and natural.