Etymology

Attentat ‎(“attack; assassination”) +‎ -er, influenced by Täter ‎(“one who does; a perpetrator”).

Pronunciation

• IPA^(key): /ˈatənˌtɛːtɐ/, [ˈatənˌtɛːtɐ], [ˈatn̩ˌtɛːtɐ] (standard; used naturally in western Germany and Switzerland)
• IPA^(key): /ˈatənˌteːtɐ/ (overall more common, particularly northern and eastern regions)