IPA: /əˈfɛkʃənəli/
KK: /əˈfɛkʃənəli/
In a way that shows love or fondness.
She spoke affectionally to her pet, showing her love and care.
Affectionally is formed from "affection" (from Latin "affectio", meaning a feeling or emotion) and the suffix "-ally" (meaning in a manner of). The word describes something done in a manner that expresses affection or fondness.
Think of 'affection' as a feeling of warmth and care, and remember that 'affectionally' means doing something in a way that shows that warmth.