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Hi Jane,
I got those terms directly from Hans Goto Sensei and from Saito Sensei's original series, "Traditional Aikido".
Kotai = "Rigid Body"
Jutai = "Supple Body"
Ryutai = "Flowing Body"
Kitai = "Energy Body" S.K.A. "Takemusu Aiki"
We usually speak more broadly in terms of "Kihon" (basics) and "Ki-no-nagare" (Energy Flow).
It's one pedagogical method. It seems to work for me.
Best Regards,
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