The Other (n.) is not everyone else. It is not those over against whom the 'I' stands out. To the contrary, the other is those from whom the 'I' does not distinguish oneself.
The Other (n.) is the ‘who’ of everyday Dasein, the group from whom for the most part I do not stand out. It is my culture, understood not as the sum of all its members, but as an ontological phenomenon in its own right.
The Other (n.) is the a priori transcendental condition of Dasein.
The Other (n.) is the condition of possibility of the self — if our connections to other beings were cut, we would not end up inside our mind - we would end up without a mind at all.
Other (n.) are not everyone else but me, over against whom I stand out; they are those from whom, for the most part, one does not distinguish oneself — those among whom one is too.