נְדָבָה nᵉdâbâh (H5071)

properly (abstractly) spontaneity, or (adjectively) spontaneous; also (concretely) a spontaneous or (by inference, in plural) abundant gift

1) voluntariness, free-will offering 1a) voluntariness 1b) freewill, voluntary, offering

from נָדַב (H5068);