I think there is too much emphasis put on the word "deceives" as most of the definitions revolved around the same theme by various names, adulteress, affair, unfaithful, AKA cheating on you. Even the Cambridge definition of sex by deceiving fits that same theme, cheating on you.
However, she can cheat on you without deceiving you. If she invites her bull over, tells you, you complain that you do not want her to fuck him, but he shows up anyways, fucks your wife in front of you. What are you going to do about it? Where you "deceived"?
I stand by my position, being a cuck means your 'other' is having sex, either behind your back or to your face, without your consent or control. Urban dictionary is like wiki, just because a bunch of people misunderstand something and propagate that belief doesn't make it so.
The very fact you planned it, or approved it, or asked it to happen, means she didn't cheat on you, she did it with your permission/blessing. You didn't get cucked.