The Oxford English Dictionary said on a statement on its website, "By the mid-20th century, 'woke' had been extended figuratively to refer to being 'aware' or 'well informed' in a political or cultural sense. In the past decade, that meaning has been catapulted into mainstream use."
The Oxford English Dictionary also says: "In the past decade, that meaning [of woke] has been catapulted into mainstream use with a particular nuance of 'alert to racial or social discrimination and injustice', popularised through the lyrics of the 2008 song 'Master Teacher' by Erykah Badu, in which the words 'I stay woke' serve as a refrain, and more recently through its association with the Black Lives Matter movement, especially on social media."
'Post-truth' was previously chosen as Oxford's 2016 word of the year. It means "relating to or denoting circumstances in which objective facts are less influential in shaping political debate or public opinion than appeals to emotion and personal belief."
The other one is 'Hygge', which refers to the recent trend around Danish culture for simple pleasures such as food and warmth and friends creating a feeling of comfort and cosiness.
'Zyzzyva' is a tropical weevil native to South American which is usually found on or near palm trees. Now this word will make the last alphabetical entry in the dictionary, where earlier it was 'zythum', a kind of malt beer brewed in ancient Egypt.