proper

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Characterized by appropriateness or suitability; fitting.
• adjective Called for by rules or conventions; correct.
• adjective Strictly following rules or conventions, especially in social behavior; seemly.
• adjective Belonging to one; own.
• adjective Characteristically belonging to the being or thing in question; peculiar.
• adjective Being within the strictly limited sense, as of a term designating something.
• adjective Ecclesiastical For use in the liturgy of a particular feast or season of the year.
• adjective Mathematics Of or relating to a subset of a given set when the set has at least one element not in the subset.
• adjective Worthy of the name; true.
• adjective Out-and-out; thorough.
• adverb Thoroughly.
• noun The portion of the liturgy that varies according to the particular feast or season of the year.

from The Century Dictionary.

• Properly; very; exceedingly.
• In geometry, not figurative; not at infinity: as, proper points.
• Special; peculiar; belonging to a species or individual and to nothing else; springing from the peculiar nature of a given species or individual; particularly suited to or befitting one's nature; natural; original.
• Belonging to one; one's own.
• Fit; suitable; appropriate.
• According to recognized usage; correct; just: as, a proper word; a proper expression.
• Rightly so called, named, or described; taken in a strict sense: in this sense usually following the noun: as, the apes proper belong to the Old World; no shell-fish are fishes proper.
• Decent; correct in behavior; respectable; such as should be: as, proper conduct.
• Well-formed; good-looking; personable; handsome; also, physically strong or active.
• In heraldry, having its natural color or colors: said of any object used as a bearing: thus, a coil of rope proper is represented brown, and the spiral lines of the cordage are indicated.
• In liturgics, used only on a particular day or festival, or during a particular octave or season: as, the proper introit; a proper preface; proper psalms.
• Fine; pretty: said ironically of what is absurd or objectionable.
• Becoming; deserved.
• Synonyms Particular, individual, specific.
• 3 and Fitting, befitting, meet, seemly, becoming, legitimate.
• noun That which is set apart to special or individual use.
• noun A property in the logical sense.
• To appropriate.
• To make proper; adorn.

from the GNU version of the Collaborative International Dictionary of English.

• adverb Colloq & Vulgar Properly; hence, to a great degree; very.
• adjective Belonging to one; one's own; individual.
• adjective Belonging to the natural or essential constitution; peculiar; not common; particular.
• adjective Befitting one's nature, qualities, etc.; suitable in all respect; appropriate; right; fit; decent
• adjective Archaic Becoming in appearance; well formed; handsome.
• adjective Pertaining to one of a species, but not common to the whole; not appellative; -- opposed to common
• adjective Rightly so called; strictly considered
• adjective (Her.) Represented in its natural color; -- said of any object used as a charge.
• adjective [Obs.] individually; privately.
• adjective (Bot.) one of the single florets, or corollets, in an aggregate or compound flower.
• adjective (Arith.) a fraction in which the numerator is less than the denominator.
• adjective (Bot.), (Gram.) a name belonging to an individual, by which it is distinguished from others of the same class; -- opposed to common noun; as, John, Boston, America.
• adjective (Bot.) that which incloses only a single flower.
• adjective (Bot.) a receptacle which supports only a single flower or fructification.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Suitable.