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 birthday party is a celebration of the anniversary of the birth of the person who is being honored. The tradition started in the mid-nineteenth century but did not become popular until the mid-twentieth century. Birthday parties are now a feature of many cultures.