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electrophilic substitution
(chemistry) in aromatic organic chemistry, a form of substitution reaction in which the leaving functional group (normally hydrogen) is replaced with an electrophile
substitution reaction
(chemistry) a reaction in which one functional group is replaced with another
substitution of attorney
A document in which the party to a lawsuit states that his/her attorney of record is being substituted for by another attorney or by the party acting for himself/herself (in propria persona).
substitution cipher
(cryptography) A method of encryption by which units of plaintext are substituted with ciphertext according to a regular system; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing an inverse substitution.
substitute teacher
(Canada, US, Ireland) A supply teacher.
substitute teachers
string substitution
(programming) The semantics-free search and replacement of one sequence of text characters with another.
