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- Anteayer -

Pronunciation: anteayer (click and listen)
Origins: “Anteayer” is an adverb. It's compound word: Ante-     ayer, where “Ante-” is a prefix equivalent to the English term “Before”, and “ayer” meas “yesterday”.
English translation: The day before yesterday.
Definition, according to the Real Academia de la Lengua (Royal Academy of the Language) (www.rae.es):
“En el día que precedió inmediatamente al de ayer.”
This could be literally translated as:
“The day that immediately precedes yesterday.”
Nota that...Spanish language can express the idea of “The day before yesterday” using two different ways: “anteayer” and “antes de ayer”, but remember the form “antesdeayer” is wrong!
Expressions: www.rae.esincludes two uses:
1.- anteayer por la noche: the day before yesterday, at night.
2.- anteayer por la tarde: the day before yesterday, in the evening.
 
Some examples:
Anteayer estuve en la oficina.
(I was at the office the day before yesterday.)
 
Mi hermana me llamó por teléfono anteayer.
(Sy sister phoned me the day before yesterday.)