It's a matter of a degree, but in the EA context (which sets a high bar), I personally call people 'altruistic' if (but not only if) they've donated >=10% of a real income for over a year or they've consistently spent over an hour a week doing something they'd otherwise rather not do to help others.

I apply a similarly high bar for altruism - many EAs don't count as altruistic based on this.