* Καλώς ήλθατε (Kalos ilthate): This is the most common and formal way to say "Welcome" in Greek, used for multiple people. It literally translates to "Well you came."
* Καλώς όρισες (Kalos orises): This is the singular, informal version of "Welcome," used for one person. It also means "Well you came."
* Υπόδεξου (Ypodeksu): This means "Welcome" as in "receive hospitably," which is a more active verb indicating welcoming someone to your home or an event.
Therefore, Καλώς ήλθατε and Καλώς όρισες are the closest equivalents to the general English meaning of "welcome." Choose the singular or plural form depending on how many people you are greeting.