What is: 1) consensus ad idem 2) non est factum 3) privity of contract?

Answer 1

1) "agreement as to the same things".
2) "it is not [my] deed"
3) The doctrine of privity in contract law provides that a contract cannot confer rights or impose obligations arising under it on any person or agent except the parties to it.

I take latin! It rocks!

Answer 2

"consensus ad idem" is a meeting of the minds. The two parties to a contract need to agree on what the contract says.

"non est factum" is Latin for "it is not my deed"
A claim of non est factum means that the signature on the contract was signed by mistake, without knowledge of its meaning, but was not done so negligently. A successful plea would make the contract voidable.

The doctrine of privity in contract law provides that a contract cannot confer rights or impose obligations on any person except the parties to it.