an additional dose that makes sure the first dose was effective | someone who contributes (or promises to contribute) a sum of money |
the first stage of a multistage rocket | someone who contracts to receive and pay for a service or a certain number of issues of a publication |
an amplifier for restoring the strength of a transmitted signal | someone who expresses strong approval |
a thief who steals goods that are in a store | |
someone who is an active supporter and advocate | |
a person who backs a politician or a team etc. | |