fixed MPP an AMP definition in glossary

glossary.asciidoc

@@ -34,12 +34,7 @@ address::
     A Bitcoin address looks like +1DSrfJdB2AnWaFNgSbv3MZC2m74996JafV+. It consists of a string of letters and numbers. It's really an encoded base58check version of a public key 160-bit hash. Just as you ask others to send an email to your email address, you would ask others to send you bitcoin to one of your Bitcoin addresses.
 
 AMP::
-   Atomic Multipath Payments.
-   A method for payments where the sender can use more than one of their channels to forward a payment.
-   By default, a sender uses one channel to forward payment. 
-   This can cause issues, for example, where a sender has two channels with an outgoing capacity of 0.5 BTC but wishes to forward a payment of 0.8 BTC.
-   By default, this payment would fail without rebalancing. 
-   With AMP, the sender can split the payment between these channels and either have the entire payment succeed or fail, with no partial payment possible. 
+   Atomic Multipath Payments was an early suggestion for a multipart payment protocol which did not get implemented but introduced the idea of splitting a single payment into multiple parts and send them along potentially different paths.
 
 Asymmetric Cryptographic System::
     Asymmetric cryptography, or public-key cryptography, is a cryptographic system that uses pairs of keys: public keys which may be disseminated widely, and private keys which are known only to the owner.
@@ -280,6 +275,10 @@ Locktime::
 millisatoshi::
     The smallest unit of account on the Lightning Network. A millisatoshi is one hundred billionth of a single bitcoin. A millisatoshi is one thousandth of one Satoshi. Millisatoshis do not exist, nor can they be settled on the Bitcoin network.
 
+mpp::
+A multipart payment (which is often also refered to as multipath payment) is a method for payments where the sender can split the payment amount into multiple smaller parts and deliver them potentially along multiple potentially disjoint paths. As the MPP strategies do not require one to send the smaller splits along different paths we find the term multipart payment more accurate than multipath payment.
+
+
 multisignature::
     Multisignature (multisig) refers to requiring more than one key to authorize a Bitcoin transaction.
     Payment channels are always encoded as multisignature addresses requiring one signature from each peer of the payment channel.