means The way you hold and position your body, especially the alignment of your back and shoulders; figuratively, the stance or attitude you adopt toward a situation.

from From Latin 'positura,' meaning a placement or arrangement, built on 'ponere,' to put or place — the same root that gives us 'position' and 'deposit.' It reached English through Italian 'postura' and French 'posture' around the early 17th century, first describing how a figure was arranged in a painting or sculpture before it settled onto living bodies and, later, onto the figurative 'stances' we strike in argument and life.