From Proto-Germanic *landam, one of the most stable Germanic words — possibly older than Indo-European itself.
The solid part of the earth's surface, as distinguished from sea, water, or air; also, a country or territory.
From Old English 'land' (earth, ground, territory, nation, a defined portion of the earth's surface), from Proto-Germanic *landą (land, territory), cognate with Old Saxon 'land,' Old Frisian 'land,' Old Norse 'land,' Dutch 'land,' and German 'Land.' The ultimate PIE origin is disputed: one reconstruction proposes PIE *lendʰ- (open land, heath, an uncultivated plain), supported by Old Irish 'land' (open space, uncultivated ground) and Old Church Slavonic 'lęda' (barren field, wasteland, heath). Another view treats the Germanic form as a pre-Indo-European substrate word, perhaps
The word 'island' has nothing to do with 'land' etymologically — it comes from Old English 'īegland' (water-land), where 'īeg' means 'water.' The 's' in 'island' was inserted in the fifteenth century by scribes who mistakenly associated it with Latin 'insula,' creating a false spelling that has persisted ever since.