The minimum and maximum values permitted as a subscript of an array for each dimension. For each dimension, there are two bounds - the upper and lower bounds - that define the range of values for subscript
The range of subscript values for elements of an array. The lower bound is the smallest subscript value in a dimension, and the upper bound is the largest subscript value in that dimension. Array bounds can be positive, zero, or negative. These bounds are specified in an array specification. See also array specification.
(n.) for a named array, the limits within which the values of the subscripts of the array elements must lie.