administrative unit

NOUN
19 LETTERS · STARTS WITH A

administrative unit is a valid 19-letter word worth 24 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1D2M3I1N1I1S1T1R1A1T1I1V4E1U1N1I1T1
1 + 2 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 4 + 1 + 0 + 1 + 1 + 1 + 1 =24 PTS
DOUBLE WORD → 48TRIPLE WORD → 72
MEANING

What does administrative unit mean?