complex

1. General: Cluster of close by and interconnected buildings, facilities, or structures (usually isolated from the surroundings by a fence or wall) built to serve a common function, such as a housing complex, medical complex, military-industrial complex.

2. Chemistry: Compound formed by the bonding of a non-metal molecule or ion to metal molecule or ion. Organic complexes (in which organic molecules bond with metal molecules) are called chelates.

3. Medicine: Syndrome of signs and symptoms of a disease or disorder.

4. Psychiatry: Manifestation of emotionally charged but repressed desires, ideas, and memories that remain active in a person's unconscious mind and continue to influence his or her behavior (or cause neurotic disorders) without the person being aware of them. The name of a complex (such as inferiority complex, Electra complex, Oedipus complex) is only for description and does not necessarily indicate a pathological condition. In popular usage, the term is a synonym for obsession.

5. Systems: Having many diverse and autonomous but interrelated and interdependent components or parts linked through many (dense) interconnections.

Very, very few businesses have barriers to entry. As wonderful and as complex as the products of these companies are, they are in industries that almost never have any barrier to entry -- especially since the general business plan is one of constant innovation, thereby obsolescing one's own products. Profitless prosperity: It's a state often found in technology, where these wonderfully innovative companies that make our lives so much more pleasant wind up unable to make any money.