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1.
A non-word that is the frequent misspelling of the word ulterior. Only "loosers" use the word alterior.
He appeared to be genuinely interested in helping me out, but he had an alterior motive.
by 8bitbrain September 02, 2011
 
2.
A neologism meaning "alternate".
He had an alterior motive.
by Awesoms64 November 12, 2010