one(a)

[adj] - having the indivisible character of a unit 2. [adj] - being the single appropriate individual of a kind 3. [adj] - being one in number--a single unit or thing 4. [adj] - of the same kind or quality 5. [adj] - used informally as an intensifier 6. [adj] - particular but unspecified 7. [adj] - indefinite in time ...
Found on http://www.webdictionary.co.uk/definition.php?query=one(a)

one(a)

unitary adjective having the indivisible character of a unit; `a unitary action`; `spoke with one voice`
Found on http://wordnetweb.princeton.edu/perl/webwn?s=one(a)
No exact match found