1 the organism's functional role in the community (e.g. TROPHIC LEVEL).  other conditions of the organism's existence, such as preferred temperature, moisture and pH, combining spatial habitat with functional interaction with other species.
birthday(Noun) The anniversary of the day on which someone is born. birthday(Noun) The anniversary of the day on which something is created. birthday(Noun) The date on which someone is born or something is created, more commonly called birthdate or date of birth.
A half-birthday is a day approximately six months before or after the anniversary of a person's birth. It is sometimes marked by people whose birthday falls near major holidays, the celebration of which may overshadow celebration of the birthday.