Synonyms:

twain,two.

Both refers to two objects previously mentioned, or had in mind, viewed or acting in connection; as, both men fired at once; "two men fired" might mean any two, out of any number, and without reference to any previous thought or mention. Twain is a nearly obsolete form of two. The two, or the twain, is practically equivalent to both; both, however, expresses a closer unity. We would say both men rushed against the enemy; the two men flew at each other. Compare [EVERY].

Antonyms:

each,either,every,neither,none,no one,not any.

BOUNDARY.

Synonyms:

barrier,confines,limit,margin,
border,edge,line,term,
bound,enclosure,marches,termination,
bourn,frontier,marge,verge.
bourne,landmark,

The boundary was originally the landmark, that which marked off one piece of territory from another. The bound is the[85] limit, marked or unmarked. Now, however, the difference between the two words has come to be simply one of usage. As regards territory, we speak of the boundaries of a nation or of an estate; the bounds of a college, a ball-ground, etc. Bounds may be used for all within the limits, boundary for the limiting line only. Boundary looks to that which is without; bound only to that which is within. Hence we speak of the bounds, not the boundaries, of a subject, of the universe, etc.; we say the students were forbidden to go beyond the bounds. A barrier is something that bars ingress or egress. A barrier may be a boundary, as was the Great Wall of China. Bourn, or bourne, is a poetical expression for bound or boundary. A border is a strip of land along the boundary. Edge is a sharp terminal line, as where river or ocean meets the land. Limit is now used almost wholly in the figurative sense; as, the limit of discussion, of time, of jurisdiction. Line is a military term; as, within the lines, or through the lines, of an army. Compare [BARRIER]; [END].