Webster's English Dictionary

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astronomical

as.tro.nom.i.cal or as.tro.nom.ic \.as-tr*-'na:m-i-k*l\ \-ik\ \-i-k(*-)le-\ 
   aj 1: of or relating to astronomy  2: enormously or inconceivably large {~ 
   figures}  - as.tro.nom.i.cal.ly av