The Collaborative International Dictionary of English v.0.48:

Am \Am\ [AS. am, eom, akin to Gothic im, Icel. em, Olr. am,
   Lith. esmi, L. sum., Gr. ?, Zend ahmi, Skr. asmi, fr. a root
   as to be. ?. See Are, and cf. Be, Was.]
   The first person singular of the verb be, in the indicative
   mode, present tense. See Be.
   [1913 Webster]

         God said unto Moses, I am that am.       --Exod. iii.
                                                  14.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Am
    n 1: a radioactive transuranic metallic element; discovered by
         bombarding uranium with helium atoms [syn: americium,
         Am, atomic number 95]
    2: a master's degree in arts and sciences [syn: Master of
       Arts, MA, Artium Magister, AM]
    3: modulation of the amplitude of the (radio) carrier wave [syn:
       amplitude modulation, AM]

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "AM":
   Ack Emma, FM, PM, amplitude modulation, ante meridiem,
   double sideband, foreday, forenoon, grey-eyed morn,
   incense-breathing morn, matins, modulation, morn, morning,
   morning time, morntime, side frequency, sideband, this AM,
   this morning, waking time



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

AM
       Amplitude Modulation


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

AM
       Active Matrix (LCD)


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

AM
       Asynchronous Mode


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

AM

   1.  Amplitude Modulation.

   2.  A program by Doug Lenat to
   discover concepts in elementary mathematics.  AM was written
   in 1976 in Interlisp.  From 100 fundamental concepts and
   about 250 heuristics it discovered several important
   mathematical concepts including subsets, disjoint sets, sets
   with the same number of elements, and numbers.  It worked by
   filling slots in frames maintaining an agenda of
   resource-limited prioritised tasks.

   AM's successor was Eurisko.

   (http://homepages.enterprise.net/hibou/aicourse/lenat.txt).

   (1999-04-19)


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

am

    The country code for Armenia.

   Used for the vanity domain "i.am".

   (1999-01-27)