0 a person born during the period 21 March to 20 April, who is believed to be influenced by the zodiac sign Aries:
1 belonging or relating to the zodiac sign Aries (= the sign for people born from 21 March to20 April):
2 (a person who has) a connection with or belief in the stated subject:
An Arian, he'll be 35 at the end of March.
I think it's a very Arian trait to want to be in control at a party and make sure everyone is enjoying themselves.