The dictionary meaning of culture is "The behaviors and beliefs characteristic of a particular social, ethnic, or age group" ex: the youth culture; the drug culture.
The term "culture" traces its roots back to German Romanticism and Herder's idea of the Volksgeist (the "spirit" of a people), which was adapted for anthropological use by Adolf Bastian. From Bastian the term diffused (via Edward B. Tylor) into British anthropology (where it never received great prominence), and (via Franz Boas) into American anthropology (where it came to define the very subject-matter of anthropology). Nevertheless, in one of the many paradoxical turns of the history of anthropology, it is Tylor's definition that is most often cited as classical.
The most used definition of culture is given by Tylor. According to Taylor, the term "culture" was used to denote the totality of the humanly created world, from material culture and cultivated landscapes, via social institutions (political, religious, economic etc.), to knowledge and meaning. Tylor's definition is still widely cited:
"Culture, or civilization, taken in its broad, ethnographic sense, is that complex whole which includes knowledge, belief, art, morals, law, custom, and any other capabilities and habits acquired by man as a member of society."