How to Say "telecommunication" in Spanish
The Spanish word for “telecommunication” is “telecomunicación” — B2 level.

Examples
La industria de la telecomunicación ha cambiado el mundo.
The telecommunication industry has changed the world.
Mi hermana estudia ingeniería de telecomunicación.
My sister is studying telecommunication engineering.
El satélite permite una mejor telecomunicación en zonas rurales.
The satellite allows for better telecommunication in rural areas.
The '-ción' Rule
Most words ending in '-ción' are feminine. Always use 'la' or 'una' with this word.
Making it Plural
To make this word plural, drop the accent mark and add '-es': 'las telecomunicaciones'.
Using the wrong gender
Mistake: “el telecomunicación”
Correction: la telecomunicación. Even though it's a long, technical word, ending in '-ción' makes it feminine.
Keeping the accent in plural
Mistake: “las telecomunicaciónes”
Correction: las telecomunicaciones. When we add syllables to words ending in '-ción', the written accent is no longer needed to show which part to emphasize.
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