greeting

call (out), nod, shout, smile, wave

She waved a friendly greeting to her neighbor across the street.

exchange

The two old friends exchanged warm greetings after not seeing each other for five years.

acknowledge, respond to, return

When he walked into the office, his colleagues acknowledged his greeting with friendly waves.

in ~

The old friends waved in greeting when they spotted each other across the crowded airport terminal.

bring, extend, send (sb)

The ambassador sent warm greetings to all the delegates at the international conference.