Refers to the amount of tokens currently staked with a particular validator. In the context of on-chain governance this may also be expressed as "voting power". This weight is a function of the total amount of tokens that are attributed to a validator (their own tokens plus those delegated to them by others). The more tokens that are attributed to a validator, the higher the validators stake weight and ultimately the higher his/her voting power. In many blockchains, stake weight is an important factor in determining which validator is allowed to validate the next block.