Section 3(9) in West Bengal Trees (Protection and Conservation in Non-Forest Areas) Act, 2006
(9)"tree" has the same meaning as in the Indian Forest Act, 1927 (16 of 1927), and includes any woody plant whose branches spring from an area supported upon a trunk or body and whose trunk or body is not less than ten centimetres in diameter at breast height from the ground level.Explanation.For the purpose of this clause "breast height" means the standard height for measuring girth, diameter and basal area of standing trees which is taken as 4 feet 6 inches (1.37 metre) above ground level and on slopes breast height is taken on the uphill side;
