The definition of "marriage" now reads: "The relationship between two people who are husband and wife, or a similar relationship between people of the same sex," with the second clause newly added.
The revision follows the marriage (same sex couples) bill through its crucial reading in the House of Lords on 15 July and accompanies other changes in a significant update to the dictionary. One that is likely to offend grammar purists is the inclusion of "of" as a preposition for use with "bored", as in "bored of".
Macmillandictionary.com editor-in-chief Michael Rundell said the change to the definition of "marriage" might suggest a future redefining of the terms "husband" and "wife". "In a same sex relationship two men are probably not going to refer to themselves as 'wife', but if it's two women, they might, so we need to keep an eye on that."
The Macmillandictionary.com definition of wife is "the woman that a man is married to", and husband is "the man that a woman is married to".