The word 'seder' is primarily used to describe the Passover meal, not other meals or events. My Jewish friend invited me to her Passover seder next week.
Pro Tip 2/3
Family Gathering
'Seder' often implies a home setting with family and friends present. We're flying to my grandparents' house for the family seder.
Pro Tip 3/3
Religious Ceremony
The seder includes specific religious readings, songs, and food, which follow a set order. During the seder, we took turns reading from the Haggadah.