a dictionary that has not been shortened by the omitting terms or definitions; a comprehensive dictionary
"My brother insists on buying an unabridged dictionary because he wants to look up every obscure word without hitting any missing entries."
An unabridged publication, especially a reference work
"She bought an unabridged dictionary to ensure every obscure word was included for her research project."
Not abridged, shortened, expurgated or condensed; complete.
"She insisted on reading the unabridged dictionary to ensure she found every possible definition of obscure words."