What does Old Irish term Bri mean?

>>The sacred tree or Bile was considered such because of its origins, its location for rituals and its nature, all in a threefold way. Everything is sacred but some things become elevated over others through choice and ritual action. Each thing has its brí from the gods but the combined spiritual/magical energy of a thing or place can be increased through buas.This is as true for trees and places, as it is for objects like swords, wands, staves and crafted items.<<

 Ref.
http://howtobeadruid.blogspot.com/2014/10/the-sacred-trees-of-ancient-ireland.html?m=1

Define "Bri":

https://en.wiktionary.org/wiki/br%C3%AD

From Old Irish bríg ‎(" force, power, value "), from Proto-Celtic *brīgo-‎(" strength ") (compare Welsh bri ‎ ... Old Irish Etymology .

Ref.

From Old Irish bríg ("force, power, value"), from Proto-Celtic *brīgo- ("strength") (compare Welsh bri ("fame, distinction")), from Proto-Indo-European *gʷrī-g-, the suffixed extended form of Proto-Indo-European *gʷerə- ("heavy").Noun, strength, vigor, meaning, significanceOrigin & history II From Old Irish brí, from Proto-Celtic *brixs.Noun brae

http://www.wordsense.eu/br%C3%AD/