IPA: /ˈlændˌhoʊldər/
KK: /ˈlændˌhoʊldər/
A person or entity that owns land or property.
The landholder decided to sell a portion of their estate.
Landholder is formed from "land" (from Old English "land", meaning ground or territory) and "holder" (from Old English "holdan", meaning to keep or possess). The word refers to a person who possesses or owns land.
Think of someone who 'keeps' ('holder') a piece of 'ground' ('land') — that's what a landholder is.