中堅
Reading
                Kana: 
                ちゅうけん
            
                    
                Romaji: 
                chūken
            
            Definitions
                    1
                
                main body (of troops)
                    2
                
                nucleus; backbone; mainstay; key figure
                    3
                
                center field; centre field; center fielder; centre fielder
                    4
                
                athlete competing in the middle-number match in a team competition, i.e. second in 3-on-3, third in 5-on-5 (kendo, judo, etc.)
                            See also:  
                                                            先鋒
    (reading せんぽう, entry #2)