As a linguistic concept? I'd probably say "midbri"
> How would one say something like "Let's go." in lojban. i.e. an imperative
> directed at a group of which the speaker is a part. Would it just be {ko
> klama}?
You can say "doi ma'a ko klama" ("Hey us, go!"). By addressing
yourself as the argument of "doi", you include yourself in the
definition of do and ko.
> (only loosely related to imperatives, but it's in the same train of thought
> for me) How does one say something like "Long live the king.", which I
> think of (with my non linguistically-trained mind) as an imperative directed
> at the universe, synonymous with "May the king live long."
>
You're really expressing a hope, I'd say. "a'o lo nolraitru ze'u jmive"
But I feel like "I hope the king lives long" and "May the king live long" are different.
{.uicu'i} Could just be my bad intuition.