Greek word
diákonos
διάκονος
What it means
an attendant, i.e. a waiter
an attendant, i.e. (genitive case) a waiter (at table or in other menial duties); specially, a Christian teacher and pastor (technically, a deacon or deaconess)
Where it comes from
probably from an obsolete (to run on errands; compare diṓkō (διώκω))