From The Collaborative International Dictionary of English v.0.48 [gcide]:
2. The posture or position of a person or an animal, or the manner in which the parts of his body are disposed; position assumed or studied to serve a purpose; as, a threatening attitude; an attitude of entreaty.
Usage: Both of these words describe the visible disposition of the limbs. Posture relates to their position merely; attitude refers to their fitness for some specific object. The object of an attitude is to set forth exhibit some internal feeling; as, attitude of wonder, of admiration, of grief, etc. It is, therefore, essentially and designedly expressive. Its object is the same with that of gesture; viz., to hold forth and represent. Posture has no such design. If we speak of posture in prayer, or the posture of devotion, it is only the natural disposition of the limbs, without any intention to show forth or exhibit.
From WordNet (r) 3.0 (2006) [wn]:
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