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The '''Categories''' ([[Latin|Lat.]] ''Categoriae'', [[Greek language|Greek]] ''Κατηγορίαι'' ''Katēgoriai'') is a work by [[Aristotle]] that aims to categorise all the possible sorts of thing which can be the [[Predicate (logic)| subject ]] or the [[Predicate (logic)| predicate ]] of a [[proposition]].  It is part of a collection of treatises now called the [[Organon]], which comprise all of his works on [[Arisotelian Logic | Logic]].

The '''Categories''' ([[Latin|Lat.]] ''Categoriae'', [[Greek language|Greek]] ''Κατηγορίαι'' ''Katēgoriai'') is a work by [[Aristotle]] that aims to categorise all the possible sorts of thing which can be the [[Predicate (logic)| subject ]] or the [[Predicate (logic)| predicate ]] of a [[proposition]].  It is part of a collection of treatises now called the [[Organon]], which comprise all of his works on [[Arisotelian Logic | Logic]].

# Some things can neither be in a subject nor be predicated of any subject. These are ''individual substances'', which cannot be predicated, because they are individuals; and cannot be in a subject, because they are substances.  

# Some things can neither be in a subject nor be predicated of any subject. These are ''individual substances'', which cannot be predicated, because they are individuals; and cannot be in a subject, because they are substances.  

Then we come to the [[category (philosophy)|categories]] themselves, (1)-(4) above being called by the [[scholastic]]s the ''[[antepraedicamenta]]''. Note, however, that although Aristotle apparently distinguished between being in a subject, and being predicated truly of a subject, in the ''[[Prior Analytics]]'' these are treated as synonymous. This has caused some to suggest that Aristotle was not the author of the ''Categories''.

Then we come to the categories themselves, (1)-(4) above being called by the [[Scholasticism | scholastic]]s the ''[[antepraedicamenta]]''. Note, however, that although Aristotle apparently distinguished between being in a subject, and being predicated truly of a subject, in the ''[[Prior Analytics]]'' these are treated as synonymous. This has caused some to suggest that Aristotle was not the author of the ''Categories''.

The ten categories, or classes, are  

The ten categories, or classes, are