1. consider (p. 26, line 8)

Sentence: In ancient times, the number seven was CONSIDERED a magical number.

Meaning: to think of someone or something in a particular way or have a particular opinion

Part of speech: verb Grammar of the word: transitive

Pronunciation: /kənˈsɪdər/

2. transmit (p. 27, line 5)

Sentence: The transmitters and receivers can be far apart on Earth, and signals can still be TRANSMITTED successfully.

Meaning: to send out electric signals for radio or television

Part of speech: verb Grammar of the word: transitive & intransitive

Spelling of participles: transmitting & transmitted

Pronunciation: /trænzˈmɪt/

Noun forms: transmission [C, U] & transmitter [C]

3. launch (p. 27, line 7)

Sentence: The first communications satellite was LAUNCHED in 1960.

Meaning: to send a weapon or a space vehicle into the sky or into space

Part of speech: verb Grammar of the word: transitive

Pronunciation: /lɔːntʃ/

4. break down (p. 27, line 9)

Sentence: The space shuttle also helps if a satellite BREAKS DOWN.

Meaning: (of a large machine) stops working

Part of speech: phrasal verb

Grammar of the word: intransitive

Noun form: breakdown [C]

5. extraordinary (p. 28, line 4)

Sentence: He conquered an EXTRAORDINARY amount of land; he conquered more land than anyone who came before him.

Meaning: very unusual, special, or surprising

Part of speech: adjective

Adverb form: extraordinarily

Pronunciation: / ɪkˈstrɔːrdəneri/