Law Dictionary

idem sonans

adjective idem so·nans \ -ˈsō-ˌnanz, -ˌnänz \

legal Definition of idem sonans

:relating to or being two names having the same or similar pronunciation or sound
  • the two names are not idem sonans
  • Johnson v. Estelle, 704 F.2d 232 (1983)
— compare misnomer
Note: An idem sonans name allows a pleading or other document (as a warrant) to be considered valid despite the minor misspelling of a name or other misidentification of a party. The fact that two trademarks are idem sonans may be used to establish the likelihood of confusion on the part of consumers in an infringement case.

Origin and Etymology of idem sonans

Latin, sounding the same


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