Maundy Thursday

Ever wondered what 'Maundy' in Maundy Thursday meant?

Maundy came from the Latin phrase, 'novum mandatum' which means the new commandment.
The new commandment being 'you love one another' that was given by Jesus during the last supper. As a demonstration of his love, he washed the feet of his disciples before dinner. In the later centuries, Christians commemorate the Last Supper with the ceremonial washing of the foot which came to be known in French as 'mande' short for 'mandatum' which means mandate or command.

Don't you find it odd how commandment sounds so different from order and yet they mean the same thing?
Command = to give orders
Commandment = a command; an edict
Order = an authoritative indication to be obeyed; a command or direction

How would you feel if you're given Ten Orders instead of Ten Commandments?
How can words that mean the same have different meanings? If you know what I mean.. =)