the.com/habituation

means The gradual decline in your response to a stimulus simply because it keeps repeating and turns out to be harmless — the fridge hum you no longer hear, the ticking clock you've stopped noticing.

from From Latin habituare, 'to bring into a condition or habit,' rooted in habere, 'to have or hold.' The same root gave English 'habit' itself — a thing you hold onto until it holds you. 'Habituation' entered scientific use as psychologists and physiologists needed a precise word for the nervous system quietly deciding a repeated signal is old news, not danger.