Find another word for since. A Modern Mercenary | Kate Prichard and Hesketh Vernon Hesketh-Prichard Sometimes Sagan taunts him with … Users with a total answer score (total upvotes minus total downvotes) of 5 or more on the tag, can vote for tag synonyms. see all tag synonyms » Users with more than 2500 reputation and a total answer score of 5 or more on the tag, can suggest tag synonyms. The lower bound of a number must be two billion plus two billion, or four billion. Johnny Carson popularized the phrase through his occasional impersonation of Sagan throughout his career. Origin: The unit is derived from the phrase billions and billions (of stars), frequently attributed to the American astronomer Carl Sagan. Sagan 's answer was the countersign he had given to his own following in the Castle. Difficulté. Auteur. 7 synonyms and near synonyms of since from the Merriam-Webster Thesaurus, plus 9 antonyms and near antonyms. Suggestions will be automatically approved when they reach a score of 4, and … Moyenne. Votre note. Sagan (Noun) A unit of measurement equal to at least four billion. Cours gratuits d'allemand > Cours et exercices d'allemand > Synonymes Cours et exercices d'allemand sur le thème : Synonymes [Changer de thème] N'oubliez pas de visiter nos guides progressifs : N° Cours et exercices gratuits d'allemand. carl-sagan currently has no approved synonyms. Candidats.