Retrieved 20 November 2013."Using dictionaries to estimate vocabulary size: essential, but rarely followed, procedures" (PDF).

Although these strategies tend to take longer to implement and may take longer in recollection, they create new or unusual connections that can increase retention.Recognize the word due to context or tone of voice.

A lexicon, or vocabulary, is a language's dictionary: its set of names for things, events, and ideas.People may still understand words they were not exposed to before using cues such as tone, gestures, the topic of discussion and the social context of the conversation."How Large Can a Receptive Vocabulary Be?" (PDF).