jalāsa
This is the word for a greeting or welcome.
anlāsi
This is the collective form, which is used far more often. It can refer to a set of greetings, or it can be the greeting itself.
selre anlāsi;
I give you greetings.
λi tērranni selirte anlāsi;
Greetings, Earthlings!
(or more literally, “Terrans, I give you(pl) greetings.”)