1. The idea or notion of hospitality towards strangers: Mr. and Mrs. Smart were convinced of xenia, and that if foreigners were treated with kindness and friendliness, they would also be treated in the same way.
2. In botany, the effect that genes from pollen have on the endosperm: The result, like an increase of size, on the embryo of a plant can be a consequence of fertilization of a genetically different variation or variety and is known as xenia.