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Attitude consists of relatively enduring beliefs around a specific object or situation, predisposing one to respond in some preferential manner.
Rokeach, M. (1968). Beliefs, attitudes, and values: A theory of organization and change. San Francisco, CA: Jossey-Bass.
According to a frequently quoted classical definition, it is a more or less consistent pattern of affective, cognitive, and conative or behavioral responses (or of feeling, thinking and behaving)towards a psychological object, but the consistency implied by this definition is a supposition that is frequently unmatched by reality, and it is possible to have an attitude towards something without ever having an opportunity to express it in behavior.
Colman, A. M. (2009). A Dictionary of Psychology. Oxford University Press.