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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
abstract syntax
A form of representation of data that is
independent of machine-oriented structures and encodings and
also of the physical representation of the data. Abstract
syntax is used to give a high-level description of programs
being compiled or messages passing over a communications link.
A compiler's internal representation of a program will
typically be an abstract syntax tree. The abstract syntax
specifies the tree's structure is specified in terms of
categories such as "statement", "expression" and
"identifier". This is independent of the source syntax
(concrete syntax) of the language being compiled (though it
will often be very similar).
A parse tree is similar to an abstract syntax tree but it
will typically also contain features such as parentheses which
are syntactically significant but which are implicit in the
structure of the abstract syntax tree.
(1998-05-26)