[CentOS] Where is the file that sets aliases?

I was having a problem in a shell script that turned out to be cp being 
aliased to 'cp -i'.  Not a showstopper, once you realise it, but it did beg 
the question as to where this file is.  I was told to look in /etc/profile.d, 
but that doesn't seem to be the case on my CentOS box.  I can list aliases, so 
I know the file exists, but where?

Anne
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