IPA: /əˈfɛkʃənətli/
KK: /əˈfɛkʃənətli/
In a way that shows love or fondness.
She spoke affectionately to her pet, showing her love and care.
Affectionately is formed from "affection" (from Latin "affectio", meaning a feeling or emotion) and the suffix "-ately" (meaning in a manner of). The word describes a manner of expressing feelings or emotions with warmth and fondness.
Think of 'affection' as a warm feeling and remember that 'affectionately' means expressing that feeling in a warm manner.