"objectivity" requires consensus.
Subjective describes one's inner experience, objective describes a shared experience - things a group of people all experience and agree on.
While it is true that our interpretation of all external events is subjectively experienced, when others also report the same experience it becomes objective.
If I were to experience something (voices or images) that referred to external events, but others that should have also experienced the same event did not - then I would assume it was just subjective (a hallucination or delusion), even though it may have seemed objective.
So "objectivity"requires consensus.
That does not mean objectivity by defnition reflects ultimately reality - but it is a good starting point for progress through emperical, scentific/critical thinking.