Sentence:  But whenever a major purchase was contemplated forty years ago - a new bedroom set or a winter coat , an <WSD>Easter</WSD> bonnet , a bicycle for Junior - the family set off for the downtown department store , where the selection would be greatest . 
Meaning of the word marked with <WSD> tags:  a Christian celebration of the Resurrection of Christ; celebrated on the Sunday following the first full moon after the vernal equinox