Conditions in an if statement 'or' I'm trying to do something like this for all the SEO meta info in my head

{% if entry or category is defined %}
 ...
{% endif %}


What's the right way to code this?

The reason for this is I have archive pages which won't be using some the meta information.
You have to type out the complete statement for each condition, i.e. 

{% if entry is defined or category is defined %}
    ...
{% endif %}