IPA: /fɪˈlætəˌlɪkli/
KK: /fɪˈlætəˌlɪkli/
In a way that relates to the collection and study of postage stamps.
He collects stamps philatelically, attending exhibitions and trading with other enthusiasts.
Philatelically → It is formed from "philos" (from Greek, meaning love) and "ateleia" (from Greek, meaning exemption from tax) combined with the suffix "-ically" (meaning in a manner relating to). The word refers to the manner of loving or collecting stamps, which are tax-exempt items.
Think of 'philos' meaning love and 'ateleia' meaning tax exemption to remember that 'philatelically' relates to the love of collecting stamps.