CH02::common tx forms: introduce technical terms

- *consolidation transaction_ for what was previously called an
  aggregating transaction

- *payment batching* for paying multiple outputs

ch02.asciidoc

@@ -296,28 +296,26 @@ balance.
 
 ==== Common Transaction Forms
 
-The most common form of transaction is a simple payment from one address
+A very common form of transaction is a simple payment. This type of
-to another, which often includes some "change" returned to the original
+transaction has one input and two outputs and is shown in
-owner. This type of transaction has one input and two outputs and is
+<<transaction-common>>.
-shown in <<transaction-common>>.
 
 [[transaction-common]]
 .Most common transaction
 image::images/mbc2_0205.png["Common Transaction"]
 
-Another common form of transaction is one that aggregates several inputs
+Another common form of transaction is a _consolidation transaction* one that spends several inputs
-into a single output (see <<transaction-aggregating>>). This represents
+into a single output (see <<transaction-consolidating>>). This represents
 the real-world equivalent of exchanging a pile of coins and currency
 notes for a single larger note. Transactions like these are sometimes
-generated by wallet applications to clean up lots of smaller amounts
+generated by wallets and business to clean up lots of smaller amounts.
-that were received as change for payments.
 
-[[transaction-aggregating]]
+[[transaction-consolidating]]
 .Transaction aggregating funds
 image::images/mbc2_0206.png["Aggregating Transaction"]
 
 Finally, another transaction form that is seen often on the bitcoin
-ledger is a transaction that distributes one input to multiple outputs
+ledger is _payment batching_ that pays to multiple outputs
 representing multiple recipients (see <<transaction-distributing>>).
 This type of transaction is sometimes used by commercial entities to
 distribute funds, such as when processing payroll payments to multiple
@@ -711,12 +709,12 @@ thus providing assurance that the miners accepted it as valid.
 
 Bob can now spend the output from this and other transactions. For
 example, Bob can pay a contractor or supplier by transferring value from
-Alice's podcast payment to these new owners. Most likely, Bob's bitcoin
+Alice's podcast payment to these new owners. Bob's bitcoin
-software will aggregate many small payments into a larger payment,
+software might consolidate many small payments into a larger payment,
 perhaps concentrating all the day's bitcoin revenue into a single
-transaction. This would aggregate the various payments into a single
+transaction. This would consolidate the various payments into a single
-output (and a single address). For a diagram of an aggregating
+output (and a single address). For a diagram of a consolidation
-transaction, see <<transaction-aggregating>>.
+transaction, see <<transaction-consolidating>>.
 
 As Bob spends the payments received from Alice and other customers, he
 extends the chain of transactions. Let's assume that Bob pays his web