"When you look back at older versions of dictionaries, there were lots of examples of flowers for instance. That was because many children lived in semi-rural environments and saw the seasons. Nowadays, the environment has changed. We are also much more multicultural. People don't go to Church as often as before. Our understanding of religion is within multiculturalism, which is why some words such as "Pentecost" or "Whitsun" would have been in 20 years ago but not now."