Re: Parsing ai ki do
I'd also add: I really would be cautious about reading the word "harmony" into "aikido". Wado (harmony-way) is another word; e.g., "Wado-ryu karate". Is harmony an important concept in aikido? Sure! But it's not in the word itself in a literal sense.
So what does "ai" mean? Well, Jim Breen's acclaimed online dictionary defines the character "ai" (verb form: "awasu") as follows:
to join together; to face; to unite; to be opposite; to combine; to connect; to add up; to mix; to match; to overlap; to compare; to check with;
So aiki is uniting, joining, fitting, etc. with ki, e.g., your opponent's ki.