What is the Meaning & Definition of salvation

The idea of salvation has a general meaning, as well as a series of different nuances depending on the contexts in which it appears.
Salvation is the release of something, whether it's an evil, a situation of captivity or a danger. A person saved when he leaves a State of suffering or discomfort.

Circumstances in which this concept is used

Danger, someone accomplishes the salvation to get rid of the risk or the threat (we save that accident miracle). The idea of risk is associated with the risk to the physical integrity, but is not always used in this sense. Think of a football team which play a decisive match to keep their category on the last day (if one can say that it has achieved the Salvation).
The word salvation is used figuratively to express an intense feeling (she is my salvation or the expression "Salvation" chart, which indicates the psychological or emotional support of someone or something).
Of course, when a person leaves a situation of captivity (in a kidnapping or a stay in prison) is said has achieved salvation.

Salvation of the soul

From the perspective of most religions, the human soul is immortal and physical death does not prevent that we can reach eternal life, provided we comply with the plan of salvation that Dios has designed for us. This idea is particularly defended by Christianity (in Catholic or Protestant version). Very synthetically, we could say that God's salvation plan is to have faith in Jesus Christ and to comply with the provisions referred to in the Bible.
Thus, our way of life will be judged in the final judgement and accordingly we conquer the salvation of the soul. We must be aware that salvation is possible but also otherwise condemns it.

Definition on the basis of Buddhism

Buddhism is a religion without God, but yes contemplates the idea of salvation. A person is not saved because you make good or have faith but because it follows from the selfish desires that oppress you, i.e., released them and thus achieves his salvation, having a sense linked to earthly life and not the most there.
Some philosophical approaches conceive salvation from an earthly perspective and apart from the idea of soul or the concept of faith. Marxism is the political and philosophical doctrine which aspires to full liberation and salvation of man, and to do this it is necessary to overcome everything that oppresses him (the revolution would be the process to conquer the new release order).