1) one who executes the commands of another, especially of a master, a servant, attendant, minister
1a) the servant of a king
1b) a deacon, one who, by virtue of the office assigned to him by the church, cares for the poor and has charge of and distributes the money collected for their use
1c) a waiter, one who serves food and drink
Part of Speech: noun masculine or feminine
Citing in TDNT: 2:88, 152
Probably from διάκω diakô (obsolete, to run on errands; compare G1377); an attendant, that is, (generally) a waiter (at table or in other menial duties); specifically a Christian teacher and pastor (technically a deacon or deaconess): - deacon, minister, servant.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root διάκονος; click on the second column to search for that grammatical form of the root διάκονος; click on the third column to search for that word and grammatical form; click on the total to search for the root διάκονος.