'm not quite sure what you mean. From the definitions you gave it would seem that you consider "brother" to mean only men. But the way you're communicating it seems that you consider it to mean everybody (i.e. all people).
Please don't try to convince me (or any one else) that according to the definitions, this is a sexist thing that discludes women. As can plainly be seen by the definitions, the word adelphos, translated brother, CAN mean anyone and everyone, male or female, greek, french, german, aussie, or even canadian, young or old, firm and infirm....in other words...EVERYONE.
And that is the point. Christians have a really BAD habit of trying to affix labels to others, or to use a label to include or disclude according to their own preferences.
Brethren CAN mean anyone.
Brethren CAN mean only a blood brother.
Brethren CAN mean a fellow believer in Christ, MALE OR FEMALE.
Brethren CAN mean someone from the same country.
brother: adelphos
1) a brother, whether born of the same two parents or only of the same father or mother
2) having the same national ancestor, belonging to the same people, or countryman
3) any fellow or man
4) a fellow believer, united to another by the bond of affection
5) an associate in employment or office
6) brethren in Christ
Being obtuse is not conducive to either conversation or growth.