IPA: /ˈpɛn.tæd/
KK: /ˈpɛnˌtæd/
A collection or set of five items or elements.
The pentad of senses includes sight, hearing, touch, taste, and smell.
Pentad → It is formed from "penta-" (from Greek "pente", meaning five) and "-ad" (a suffix used in forming nouns). The word "pentad" refers to a group or set of five.
Think of the Greek root "pente" meaning five, which helps you remember that a pentad is a group of five.