11. A system for translating word sequences in a source language to translations in a target language, the system comprising: a processor; and a memory storing: a word index comprising, for respective words of the language: the word stored at an index location in the word index, and a word mapping that identifies the index location of the word in the word index; a translation mapping identifying, for a word index sequence comprising at least two word indices, the translation of the words of the word sequence mapping to the respective index locations of the words of the word index sequence; and instructions that, when executed by the processor, provide a translator that, upon receiving a word sequence in the source language to be translated into the target language: for respective words of the word sequence, identifies the source index location of the word in the source word index; using the translation mapping, identifies a translation of the source index locations of the words of the word sequence, the translation comprising at least one target index location in the target word index; for respective target index locations, retrieves a translated word in the target language at the target index location in the target word index; and presents the translated words in the target language.
11. A system for translating word sequences in a source language to translations in a target language, the system comprising: a processor; and a memory storing: a word index comprising, for respective words of the language: the word stored at an index location in the word index, and a word mapping that identifies the index location of the word in the word index; a translation mapping identifying, for a word index sequence comprising at least two word indices, the translation of the words of the word sequence mapping to the respective index locations of the words of the word index sequence; and instructions that, when executed by the processor, provide a translator that, upon receiving a word sequence in the source language to be translated into the target language: for respective words of the word sequence, identifies the source index location of the word in the source word index; using the translation mapping, identifies a translation of the source index locations of the words of the word sequence, the translation comprising at least one target index location in the target word index; for respective target index locations, retrieves a translated word in the target language at the target index location in the target word index; and presents the translated words in the target language. 16. The system of claim 11 , wherein the translation language is selected from a language translation set comprising: a translation between a first natural language and a second natural language; a translation between a first dialect of a language and a second dialect of the language; a translation between a first language modality of a natural language and a second language modality of the natural language; a translation between a colloquial version of a natural language and a standardized version of the natural language; and a translation between a technical language and a natural language.