La bibliotekisto renovigas mian membrecon.

It is built from smaller parts:

• biblioteko = library
• -isto = a person associated with a profession, activity, or ideology
• -o = noun ending

So bibliotekisto literally means library-person / someone who works with the library, which is how Esperanto says librarian.

By itself, bibliotekisto is normally gender-neutral. It can refer to a librarian of any gender unless the context makes it specific.

If you want to specify, you can say:

• bibliotekistino = female librarian
• vira bibliotekisto = male librarian

But the plain form bibliotekisto does not automatically mean male.

La is Esperanto’s definite article, meaning the.

So:

• la bibliotekisto = the librarian
• bibliotekisto = a librarian or just librarian in a general sense

Esperanto has no indefinite article like English a/an, so the absence of la often covers that idea.

Because mian already means my, and possessives usually make the noun definite enough on their own.

So Esperanto normally says:

• mia libro = my book
• mian membrecon = my membership (as the object)

Using la together with a possessive before a full noun is usually not the normal choice here. So la mian membrecon would sound wrong in ordinary usage.

Renovigas can be broken down like this:

• re- = again, back
• nov- = new
• -ig- = cause to become, make
• -as = present tense

So renovigas literally means makes new again. In normal English, that is simply renews.

The -ig- part is very common in Esperanto. It often turns an idea into cause/make something become that.

Related forms:

• renovigi = to renew something
• renoviĝi = to become renewed, renew itself

Here the librarian is doing the action to the membership, so renovigas is the right kind of form.

-As marks the present tense.

So renovigas can mean:

• renews
• is renewing

Esperanto’s present tense does not force the same distinction English does between simple present and present progressive. Context tells you which is more natural.

Because membrecon is the direct object, and in Esperanto the direct object usually takes -n.

Also, adjectives and adjective-like words must agree with the noun they describe. Mia is a possessive adjective, so it agrees too.

That gives:

• mia membreco = my membership
• mian membrecon = my membership, as the direct object

So:

• membreco gets -n because it is the thing being renewed
• mia becomes mian to agree with membrecon

Membro means member: a person.

Membreco means membership: the state or status of being a member.

It uses the suffix -ec-, which forms nouns meaning quality, state, or condition.

So:

• membro = member
• membreco = membership

In this sentence, the librarian is not renewing you, the member. The librarian is renewing your membership status, so membrecon is the correct word.

Yes, Esperanto word order is fairly flexible, because the -n ending helps show what the object is.

The neutral order here is:

• La bibliotekisto renovigas mian membrecon.

But you could also say:

• Mian membrecon renovigas la bibliotekisto.

That puts more emphasis on my membership.

Even so, the basic subject–verb–object order is the most common and easiest for learners.

Esperanto stress is very regular: it falls on the second-to-last syllable of each word.

So:

• la = lah
• bibliotekisto = bib-li-o-te-KIS-to
• renovigas = re-no-VI-gas
• mian = MI-an
• membrecon = mem-BRE-con

A natural pronunciation would sound roughly like:

lah bib-li-o-te-KIS-to re-no-VI-gas MI-an mem-BRE-tson

The c in Esperanto is always pronounced like ts.