Where do aliases come from?

[agou <agou@talktalk.net>]

I have installed the latest stable debian (AMD64) not long ago, and I am 
baffled, to say the least by a thing - normally, one of the first things 
I do after installing Linux is to hunt down all the "helpful" aliases 
that are set up in /etc/profile, ~/.profile, /etc/profile.d etc etc (I 
use ksh) and define just one (ll='ls -lp'). I did the same this time, 
but I still find:

# alias
2d='set -f;_2d'
autoload='typeset -fu'
command='command '
fc=hist
float='typeset -lE'
functions='typeset -f'
hash='alias -t --'
history='hist -l'
integer='typeset -li'
ll='ls -lp'
nameref='typeset -n'
nohup='nohup '
r='hist -s'
redirect='command exec'
source='command .'
stop='kill -s STOP'
suspend='kill -s STOP $$'
times='{ { time;} 2>&1;}'
type='whence -v'

Where are they defined - does anybody know?