What does "eastertide" mean?

The season from Easter Day to Whitsun, inclusive thereof.

What is a synonym for "eastertide"?

Common synonyms include: advent, ash wednesday, carnival, christmas, corpus christi, easter.

noun

noun ·Rare ·Advanced level

Noun

1
The season from Easter Day to Whitsun, inclusive thereof. uncountable
"Meronyms: Easter, Easter Day, Easter Sunday, Holy Week, Easter Week"
2
the Easter season wordnet

"Meronyms: Easter, Easter Day, Easter Sunday, Holy Week, Easter Week"

From Easter + -tide (“period surrounding a festival”).