IPA: /ˈɡrædʒuəli/
KK: /ˈgrædʒuəli/
In a way that happens slowly over time, rather than all at once.
The temperature gradually increased throughout the day.
Gradually → It is formed from "gradus" (meaning step) and the suffix "-ally" (meaning in a manner). The word "gradually" means in a manner that takes place by steps or stages.
Think of taking things 'step by step' ('gradus') to remember that 'gradually' means something happens slowly over time.