While originality is a requirement for copyright around the world, there is no coherent definition of what it means for a work to be original.

None of these terms has a single coherent and widely agreed-upon definition, so their exact relationships are unclear.

There is no coherent, consistent and widely accepted definition of alternative medicine.

The field of frequency stability has been studied for a long time, however it was found during the 1960s that there was a lack of coherent definitions.

It was all some part of the Hunt, though she couldn't put any coherent definition on what was going on.

Don't bother asking for a coherent definition.

The view that a coherent definition of God must be presented before the question of the existence of God can be meaningfully discussed.

However, there is debate over the definition of pitch accent, and whether a coherent definition is even possible.

For example, we do not have in our legislation any coherent definition of what organised crime is.

It includes the difficulties involved in producing a coherent definition of racism (cf.