From WordNet (r) 2.0 (August 2003) [wn]:
friendly
adj 1: characteristic of or befitting a friend; "friendly advice";
"a friendly neighborhood"; "the only friendly person
here"; "a friendly host and hostess" [ant:
unfriendly]
2: favorably disposed; not antagonistic or hostile; "a
government friendly to our interests"; "an amicable
agreement"
3: easy to understand or use; "user-friendly computers"; "a
consumer-friendly policy"; "a reader-friendly novel" [ant:
unfriendly]
4: of or belonging to your own country's forces or those of an
ally; "in friendly territory"; "he was accidentally killed
by friendly fire" [ant: hostile]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Friendly \Friend"ly\, adv.
In the manner of friends; amicably; like friends. [Obs.]
--Shak.
[1913 Webster]
In whom all graces that can perfect beauty
Are friendly met. --Beau. & Fl.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Friendly \Friend"ly\, a. [AS. fre['e]ndl[imac]ce.]
1. Having the temper and disposition of a friend; disposed to
promote the good of another; kind; favorable.
[1913 Webster]
2. Appropriate to, or implying, friendship; befitting
friends; amicable.
[1913 Webster]
In friendly relations with his moderate opponents.
--Macaulay.
[1913 Webster]
3. Not hostile; as, a friendly power or state.
[1913 Webster]
4. Promoting the good of any person; favorable; propitious;
serviceable; as, a friendly breeze or gale.
[1913 Webster]
On the first friendly bank he throws him down.
--Addison.
Syn: Amicable; kind; conciliatory; propitious; favorable. See
Amicable.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Friendly \Friend"ly\, n.
1. A friendly person; -- usually applied to natives friendly
to foreign settlers or invaders.
These were speedily routed by the friendlies, who
attacked the small force before them in fine style.
--E. N.
Bennett.
[Webster 1913 Suppl.]
2. (Mil.) A member of one's own military forces, or of allied
forces.
[PJC]