Following Parliament's legalization of same-sex marriage on July 17 (despite fierce opposition from Tory MPs and grassroots members), the Oxford English Dictionary is changing the definition of the word "marriage". According to the Daily Mail:

Language experts at the Oxford English Dictionary said the definition did not change overnight but they will monitor how the word marriage changes over the next year.

As it stands, OxfordDictionaries.com defines marriage as being a ‘formal union of a man and a woman, typically as recognised by law, by which they become husband and wife.’

In a reference, it says marriage could also be ‘(in some jurisdictions) a union between partners of the same sex’.