Henry George Liddell, Robert Scott, An Intermediate Greek-English Lexicon

I.to names of Places in the acc., to denote motion towards that place, οἶκόνδε (attic οἴκαδε) home- wards, ἅλαδε sea- wards, Οὐλυμπόνδε to Olympus, θύραζε (for θύρασδε) to the door, Hom.; sometimes repeated with the possess. Pron., ὅνδε δόμονδε; and sometimes even after εἰς, as εἰς ἅλαδε Od.; in Ἀϊδόσδε it follows the gen., = εἰς Ἅιδου (sc. οἶκον). In attic joined to the names of cities, Ἐλευσῖνάδε, Ἀθήναζε, Θήβαζε (for Ἀθήνασδε, Θήβασδε).

2.sometimes it denotes purpose only, μή τι φόβονδ᾽ ἀγόρευε speak not aught tending to fear, Il.

II.-δε is also used to strengthen certain Pronouns, ὅδε, τοιόσδε, etc.