IPA: //ˈbɛkənɪŋli//
KK: /ˈbɛkənɪŋli/
In a way that invites someone to come closer or to follow, often in a friendly or enticing manner.
She waved beckoningly to her friend across the street.
Beckoningly → It is formed from "beckon" (from Old English "beacnian", meaning to signal or summon) and the suffix "-ingly" (meaning in a manner of). The word "beckoningly" describes the manner of signaling or summoning someone.
Think of someone signaling or summoning you in a specific way — that's what beckoningly means.