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\documentclass[a4paper,10pt]{report} 
\usepackage[utf8x]{inputenc}
 \usepackage[ngerman]{babel} 
\usepackage{amsmath} 
\usepackage{amsfonts}    
\usepackage{amssymb}    
 \begin{document}  
\newtheoremstyle{definition}% name of the style to be used  
 {}% measure of space to leave above the theorem. E.g.: 3pt   
{}% measure of space to leave below the theorem. E.g.: 3pt   
{}% name of font to use in the body of the theorem   
{}% measure of space to indent   
{}% name of head font  
 {}% punctuation between head and body  
{}% space after theorem head; " " = normal interword space  
{}% Manually specify head  \newtheoremstyle{definition}
 \newtheorem{definition}{Definition}  
\begin{titlepage} 
\begin{center} 
\vspace*{\fill}{\huge BLABLA} \vfill{{BLABLA \\ BLABLA \\ BLABLA}} 
\vfill{{BLABLA}\\ 	{BLABLA}}
 \end{center} 
\end{titlepage}  
\tableofcontents  \setcounter{chapter}{-1} 
\chapter{BLABLA}  
\begin{definition}Diese Defintion soll nicht kursiv sein...
 \end{definition}   
\end{document}