Transaction - ISDA Provision
1992 ISDA
Not defined in Part 14 as such, but defined in the preamble as:
... one or more transactions (each a “Transaction”) that are or will be governed by this Master Agreement.
2002 ISDA
“Transaction” has the meaning specified in the preamble.
2002 ISDA Equity Derivatives Definitions
The 2002 ISDA Equity Derivatives Definitions also define "Transaction", to no apparent point.