Is the definition ...?

NO silly, that's cute though!

That is as much the definition of "unison" is as "content" is a temporary building made out of cloth that surrounds a frame, which is used primarily on outings for convicted felons.

har har har lol.

no... the definition of unsion is as follows:

u·ni·son /ˈyunəsən, -zən/ Pronunciation Key - Show Spelled Pronunciation[yoo-nuh-suhn, -zuhn] Pronunciation Key - Show IPA Pronunciation

–noun 1. coincidence in pitch of two or more musical tones, voices, etc.

2. the musical interval of a perfect prime.

3. the performance of musical parts at the same pitch or at the octave.

4. a sounding together in octaves, esp. of male and female voices or of higher and lower instruments of the same class.

5. a process in which all elements behave in the same way at the same time; simultaneous or synchronous parallel action: to march in unison.

—Idiom6. in unison, in perfect accord; corresponding exactly: My feelings on the subject are in unison with yours.

i thought unison meant in agreement or accordance

Nope. The definition of "unison" is: "breast milk"!

I thought Unison was a sleep aid. Just kiddin' just kiddin'.

The definition of unison is all together.

For example:

The choir sings in unison.

The choir sings all together.

No, it means simultaneous performance of action or speech, but we can go with yours, sounds better.

no if soomething is in unison, it is the same or in tune together

it's an identity of musical pitch,two or more tones.