Augmented reality (AR) devices can be configured to monitor ambient audio data. The AR device can detect utterances in ambient audio data, convert detected utterances to text, or detect keywords such as rare words in utterances. When a rare word is detected, the AR device can retrieve auxiliary information (eg, definitions) associated with the rare word from public or private sources. The AR device may display ancillary information for the user to help the user better understand the utterance. The AR device may perform translation of the foreign language utterance and may display the text (or translation) of the speaker's utterance to the user or may display statistical or other information associated with the utterance.
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