What does s-expression mean?

Definitions for s-expression

Here are all the possible meanings and translations of the word s-expression.

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  1. A symbolic expression.


  1. In computing, s-expressions, sexprs or sexps are a notation for nested list data, invented for and popularized by the programming language Lisp, which uses them for source code as well as data. In the usual parenthesized syntax of Lisp, an s-expression is classically defined inductively as ⁕an atom, or ⁕an expression of the form where x and y are s-expressions. The second, recursive part of the definition represents an ordered pair so that s-exprs are effectively binary trees. The definition of an atom varies per context; in the original definition by John McCarthy, it was assumed that there existed "an infinite set of distinguishable atomic symbols" represented as "strings of capital Latin letters and digits with single embedded blanks". Most modern sexpr notations in addition use an abbreviated notation to represent lists in s-expressions, so that stands for where NIL is the special end-of-list symbol. In the Lisp family of programming languages, s-expressions are used to represent both source code and data. Other uses of S-expressions are in Lisp-derived languages such as DSSSL, and as mark-up in communications protocols like IMAP and John McCarthy's CBCL. The details of the syntax and supported data types vary in the different languages, but the most common feature among these languages is the use of S-expressions and prefix notation.


  1. The numerical value of s-expression in Chaldean Numerology is: 2

  2. The numerical value of s-expression in Pythagorean Numerology is: 1

Examples of s-expression in a Sentence

  1. This expression is more commonly seen in the classical period, specifically in the eighth century between the years 700 CE to 800 CE, which is the last century of the Mayan culture and very close to its collapse, in the years following 800 CE, the Mayan cities started to collapse. That (event) has a strong relationship with the frequency of the number of wars which began in this century.

  2. During the past few days, many of you have been practicing your right of freedom of expression, the claims have been overwhelming, and I have received them with the highest degree of humility.

  3. Some governments are unable to maintain security and meet the basic needs of their people, while others are simply unwilling, states that restrict freedoms of expression and peaceful assembly; that allow and commit violence against members of religious, ethnic, and other minority groups; or that undermine the fundamental dignity of persons are morally reprehensible and undermine our interests.

  4. To lose a son, to lose a brother, sister, dad — that pain, that intensity, that expression is reflected not just in the words of these two remarkable women and their families, but we hope reflected in this legislation.

  5. A credit union is not an ordinary financial concern, seeking to enrich its members at the expense of the general public. Neither is it a loan company, seeking to make a profit at the expense of the unfortunates… The credit union is nothing of the kind; it is the expression in the field of economics of a high social ideal.

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