What is the meaning of Kilogram?

In the International System of Units, the base unit of mass; conceived of as the mass of one litre of water, but now defined by taking the fixed numerical value of the Planck constant $h$ to be 6.626 070 15 × 10 when expressed in units of kg⋅m⋅s. Symbol: kg

The unit of weight such that a one-kilogram mass is also a one-kilogram weight.