[Domenic_S]

I agree with both of you, and I wish there was a better word than "ownership". That term has implications that are inappropriate for a single feature. You don't own the autocomplete widget -- you're responsible for it but you don't own it, the company owns it.

[jerf]

You both own(1) the widget and do not own(2) the widget.

This is English. Multiple definitions for a word are common. Cases where only some definitions apply and not others are common. They happen in almost every sentence. Try to avoid letting that pollute your thought. (It is a challenge. No sarcasm.)

[dontusually2]

Amazon.com's second leadership principle:

Ownership Leaders are owners. They think long term and don’t sacrifice long-term value for short-term results. They act on behalf of the entire company, beyond just their own team. They never say “that’s not my job."

Unfortunately, we no longer live in a society where the employer-employee relationship is one of trust. The definition Amazon.com seems to be using is that owners do shit work and so should you, but maybe I'm misreading.

[wwweston]

"Stewardship" might be the word we're looking for: it has some connotations of personally invested care, but it's also clear that it's done on behalf of someone else and there's no ownership.

Of course, it also has a history of association with servants of landed gentry, which might make people uncomfortable (for good reasons, to the extent the analogy holds up).

[logfromblammo]

The word is "stewardship".

[hfsktr]

I think you could also say you manage instead of own and it would still make sense.