In general, I would say that "normal" suggests that nothing is wrong or strange or especially bad about the thing. "Ordinary" suggests that nothing is unusual or special about it. Here's the best example I can think of -- the parents of a new baby would be relieved to hear that the baby is "normal" (it has the right number of arms and legs and fingers and toes and so on), but they would be insulted if someone called their baby "ordinary" (not special in any way).
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Ordinary basically means normal, but it's not the same thing, I do what I normally do, not what I ordinarily do, ordinary implies you're usual to everyone else without regard to physical, emotional or mental health, normal is concerned with the three and is never even changing yourself unless you're reinventing yourself, and I have reinvented myself. However the way I changed, was from a confo
Generally speaking, normal is used in more scientific-type situations, while ordinary is used in more everyday- type situations. For example:
Your blood sugar and cholesterol levels are normal (not ordinary).
He's just your ordinary (not normal) guy, with a wife and kids, working 9 to 5, 40 hrs. a week.
This is not normal (not ordinary) behavior for a 7 yr. ol