This is the 7230th most frequent Catalan word.
altera
"Altera" means "alters" or "modifies" in English.
Here, 'altera' is used in the sense of causing a change or modification in the state of something.
L'emoció altera el ritme cardíac.
Emotion alters the heart rate.
Here, 'altera' is used to describe causing a disturbance or unease in people due to external conditions.
L'ambient tènse altera a tothom.
The tense atmosphere upsets everyone.
In this sentence, 'altera' signifies a change being applied to something, specifically a schedule or plan.