What does it mean to be feminine? What does it mean to be masculine?
Being feminine is not just to be biologically female. Any human being can have feminine qualities. Traits such as being empathetic, sensitive, nurturing, caring, elegant and gentle are all examples of characteristics associated with being feminine. Physical characteristics involving femininity are being short and small, wearing makeup and wearing girly and pretty clothing.
Being masculine is also not just to be biologically male. Females can have masculine attributes as well. Traits such as being strong, protective, tough, fearless and brave are all examples of characteristics associated with being masculine. Physical characteristics involving masculinity are being big, built, tall, having short hair and wearing male clothing.
Generally females are more feminine than males and males are more masculine than females. There are exceptions for transgender human beings who may display more traits and physical characteristics from the opposite sex.