0 a person born during the period 21 January to 19 February, who is believed to be influenced by the zodiac sign Aquarius: --
My niece Kate and I are both Aquarians.
He's an Aquarian.
1 belonging or relating to the zodiac sign Aquarius (= the sign for people born from 21 January to 19 February): --
Planning isn't really an Aquarian thing.
We're both Aquarians and dreamers.
True Aquarians are said to be friendly, creative, optimistic, and fond of science and literature.