Example : We made a tentative arrangement to meet on Friday .
★ nuclear (adj.) : using ,producing,or resulting from nuclear energy
Example : a nuclear power station
★ vocal (adj) : connected with the voice
Example : the vocal organs (=the tongue,lips,etc)
★ leverage (noun) : (formal) the ability to inflience what people do
Example : Retailers can exert leverage over producers by threatening to take their business elsewhere.
Example : The fire flared into life.
Artical : http://www.oxfordlearnersdictionaries.com/spellcheck/american_english/?q=+recalibrat