How to Say "capitulation" in Spanish
The Spanish word for “capitulation” is “rendición” — B2 level. This is a very common word in everyday Spanish.

Examples
El general firmó la rendición del ejército.
The general signed the army's surrender.
Su rendición ante las dificultades nos sorprendió a todos.
His giving up in the face of difficulties surprised us all.
Exigieron una rendición incondicional para detener el ataque.
They demanded an unconditional surrender to stop the attack.
The 'Female' Ending
Words that end in '-ción' are almost always treated as female nouns. You should use 'la' or 'una' with this word.
Plural Spelling
When you make this word plural (rendiciones), the written accent mark on the 'o' disappears.
Confusing with 'Performance'
Mistake: “Using 'rendición' to talk about how well an athlete or engine performs.”
Correction: Use 'rendimiento' for performance; 'rendición' is only for giving up or reporting.
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