5. The method of claim 1 , wherein using the locally stored new vocabulary for any of word prediction, completion, or word correction comprises using the locally stored new vocabulary in combination with the locally stored primary vocabulary as a contiguous body of words.
1. A method for any of word prediction, word completion, or word correction at a client device, the client device having a memory and a processor in communication with the memory, wherein the processor performs the method comprising: storing a local primary vocabulary at the client device, wherein the local primary vocabulary pertains to any of a language, a subject matter, a functional purpose, or a content; receiving a sequence of one or more symbols from a user through entry of a sequence of keypresses by the user; transmitting at least a most recent portion of the sequence over a network after each of the keypresses; updating the locally stored primary vocabulary from a corresponding remote vocabulary of a plurality of remote vocabularies over the network that pertains to the transmitted most recent portion of the sequence after each of the keypresses, when the transmitted portion of the sequence includes one or more words that overlaps both the corresponding remote vocabulary and the locally stored primary vocabulary; receiving a new vocabulary of the plurality of remote vocabularies over the network that pertains to the transmitted most recent portion of the sequence after each of the keypresses, wherein the new vocabulary pertains to a topic, wherein the new vocabulary includes a plurality of words that correspond to the topic, when the transmitted most recent portion of the sequence includes one or more words that overlap the new vocabulary, such that the new vocabulary has associated therewith a measure of confidence above a prescribed threshold with respect to the transmitted most recent portion of the sequence, wherein the transmitted most recent portion of the sequence significantly overlaps the new vocabulary while lacking significant overlaps with the locally stored primary vocabulary and others of the plurality of remote vocabularies, wherein receiving the new vocabulary comprises receiving a notice over the network that a new vocabulary is available that pertains to the transmitted sequence, and downloading the new vocabulary over the network in response to the received notice; locally storing the received new vocabulary at the client device; receiving text entered by the user; and for the received text, using the updated locally stored primary vocabulary or the locally stored new vocabulary for any of word prediction, completion, or word correction.