1 : the way in which your body is positioned when you are sitting or standing
Human beings have an upright posture.
a rigid/stiff posture
He has good/bad/poor posture.
2 [count], formal : the attitude a person or group has toward a subject — usually singular
The country has taken an aggressive posture on immigration.
She took a neutral posture in the argument.
— postural /ˈpɑːstʃərəl/ adjective, always used before a noun, formal
poor postural habits