Board Thread:The Panopticon/@comment-45314928-20200525010944/@comment-45692830-20200525033331

Are you telling me that Doctor in Distress didn't give us a valid definition of companion as "[a] screaming girl [who] just hoped That a Yeti wouldn't shoot her"? Perish the thought.

Joking aside, I, again, don't think this distinction makes sense. Especially not from an in universe perspective. We know that to the Doctor all our lifespans are short. So while he might want particular people to stay around for long periods of time (eg Clara) I'm not sure that the distinction between one story and two stories would be meaningful for him.

Also, if we're discussing River Song, it's impossible to watch Silence in the Library and come away from it thinking that she never met 10 before. It's heavily implied that she's met that particular incarnation before off screen. Obviously this decision was made before S5 and onward was filmed, but I don't think it's possible to say that they were strangers. Indeed, at one point they had a picnic at Asgard, but that was changed to Eleven. So there's clear authorial intent that they've actually interacted a reasonable amount, even if we don't know of specific instances to put in the wiki. It's not at all reasonable to list her as "ambiguous". As with all things, she has her own category.