This is the 4624th most frequent German word.
tausend
"Thousand."
Here, 'tausend' is used as a numeral to quantify the reasons.
Er hat tausend Gründe, glücklich zu sein.
He has a thousand reasons to be happy.
In this expression, 'tausend' emphasizes gratitude strongly.
Tausend Dank für Ihre Hilfe!
A thousand thanks for your help!
'Tausend' specifies a duration of time, giving it a literal numeric meaning.