Secret Intelligence Service

/ˌsikrɪt ɪnˌtɛlədʒəns ˌsʌrvəs/
IPA guide

Definitions of Secret Intelligence Service
  1. noun
    the government agency in the United Kingdom that is responsible for internal security and counterintelligence overseas
    synonyms: MI, Military Intelligence Section 6
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    type of:
    international intelligence agency
    an intelligence agency outside the United States
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