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 I.  adjective see:  full  
 Date: 1579
 algebraically positive, having, receiving, or being in addition to what is anticipated, 
 
 3. falling high in a specified range , greater than that specified, possessing a specified quality to a high degree, electrically positive, relating to or being a particular one of the two mating types that are required for successful fertilization in sexual reproduction in some lower plantlike organisms (as a fungus), 
 
 II.  noun (plural pluses; also plusses)
 Date: 1654
  plus sign  , an added quantity, a positive factor or quality,  surplus  , 
 
 III. preposition
 Date: 1668
 increased by ; with the addition of ,  besides  , 
 
 IV. conjunction
 Date: circa 1950
  and  , in addition to which , 
 Usage: The preposition plus has long been used with a meaning equivalent to and (as in “two plus two”); it is not, therefore, very surprising that in time people have begun to use it as a conjunction much like and. Sense 2 is considered to be an  adverb by some commentators. It is used chiefly in speech and in informal writing.

 plus ça change, plus c'est la même chose 
 foreign term 
 Etymology: French the more that changes, the more it's the same thing

 plus fours 
  noun plural
 Date: 1920
 loose sports knickers made four inches longer than ordinary knickers

 plus or minus 
 
 
 I.  adjective 
 Date: 1926
 indicating a quantity whose algebraically positive and negative values serve to bracket a range of values either alone or when added to and subtracted from a given number , 
 
 II.  adverb 
 Date: 1849
  more or less  , approximately

 plus royaliste que le roi 
 foreign term 
 Etymology: French more royalist than the king

 plus sign 
  noun 
 Date: 1841
 a sign + denoting addition or a positive quantity