For example:

> 
> Cardinality and optionality are
>  orthogonal properties of a
>  relationship. You can specify that a
>  relationship is optional, even if you
>  have specified upper and/or lower
>  bounds. This means that there do not
>  have to be any objects at the
>  destination, but if there are then the
>  number of objects must lie within the
>  bounds specified.
> 
> 
> 

What exactly does "orthogonal" mean? I bet it's just a fancy soundig nerd-style word for something that could be expressed a lot easier to understand for average people ;)

From wikipedia:

> 
> In mathematics, two vectors are
>  orthogonal if they are perpendicular,
>  i.e., they form a right angle. The
>  word comes from the Greek ὀρθός
>  (orthos), meaning "straight", and
>  γωνία (gonia), meaning "angle".
> 
> 
> 

Anyone?