The fellow wordsmiths here at #WAFFwords fought hard to include this word in our litany of literary indices, though it doesn't have an official dictionary listing.
That's not to say a "dictionary" doesn't give us the meaning of the word "sonder."
The Dictionary of Obscure Sorrows, written by John Koenig, is intended to "fill a hole in the language." Many of his recent creations attempt to describe feelings and concepts that are too complex for simple thesaurus-style word options.
"Sonder" is no different. According to Koenig, it describes "the realization that each random passerby is living a life as vivid and complex as your own... an epic story that continues invisibly around you... elaborate passageways to thousands of other lives that you'll never know existed."
As with many of his entries, "sonder" comes complete with its own video representation. For mobile devices, you can watch it here.
Even if you choose not to adopt the words coined by the Dictionary of Obscure Sorrows, you have to admire its creator's poetic depths.
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