The Collaborative International Dictionary of English v.0.48:

CER \CER\ n.
   a conditioned emotional response, an emotional response
   that has been acquired by conditioning. [acronym]

   Syn: conditioned emotional response, conditioned emotion.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

CER
    n 1: an emotional response that has been acquired by
         conditioning [syn: conditioned emotional response, CER,
         conditioned emotion]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

CER
       Cell Error Ratio (ATM)


The Free On-line Dictionary of Computing (30 December 2018):

Canonical Encoding Rules
CER

    (CER) A restricted variant of BER for
   producing unequivocal transfer syntax for data structures
   described by ASN.1.

   Whereas BER gives choices as to how data values may be
   encoded, CER and DER select just one encoding from those
   allowed by the basic encoding rules, eliminating all of the
   options.  They are useful when the encodings must be
   preserved, e.g. in security exchanges.

   CER and DER differ in the set of restrictions that they
   place on the encoder.  The basic difference between CER and
   DER is that DER uses definitive length form and CER uses
   indefinite length form.

   Documents: ITU-T X.690, ISO 8825-1.

   See also PER.

   (1998-05-19)