Post-truth has been voted Word of the Year 2016 by both Oxford Dictionaries and the GfdS (Gesellschaft für deutsche Sprache or Society for the German Language). The expression is defined as ‘relating to or denoting circumstances in which objective facts are less influential in shaping public opinion than appeals to emotion and personal belief’.
This expression was chosen due to its extensive use over the past year in connection with the UK referendum and the US election. It is most often used with a noun, as in post-truth politics.
Other words in the top 10 of the Oxford Dictionaries are Brexiteer (a UK person in favour of leaving the EU), alt-right (a US group associated with extreme conservatism and reactionary viewpoints), as well as coulrophobia (the fear of clowns) and Latinex (a gender-neutral alternative to Latino or Latina).