The society is not known to have a well-defined national organizational structure.

This is clearly not the case for intrinsically unfolded proteins that remain functional despite the lack of a well-defined structure.

There is chance in his paintings, but it occurs within a well-defined structure.

It is impossible to construct well-defined large structures from flexible components.

But the cocaine industry does not appear to have the well-defined hierarchical structure of organized crime in the United States.

Halogen bonds are strong, specific, and directional interactions that give rise to well-defined structures.

Nevertheless, it has a well-defined interior structure, described below.

The A subunit has a less well-defined secondary structure.

And there he's completely correct because many forms of data have pretty well-defined structure.

Density wave theory is the preferred explanation for the well-defined structure of grand design spirals.