At a personal level, the definition of success could be anything.For example, if you set the goal of reducing weight by 3 kg and even if achieve 1 kg reduction, that is the success and needs to be celebrated.Celebrate it on your way. It could be anything, even expressing your happiness to your dear ones. This happiness feeling will give you the motivation to reduce further weight.
Similarly, in organizational setup, even small achievement of success towards big target must be celebrated with the team in the form communication, appreciation, gifting, etc.This will bring more positiveness inside the organization, and eventually, that becomes the culture of winning mindset.
The point is irrespective of the size of the success; you need to celebrate and feel happy about your achievement that will give internal motivation to move up further. Your state of mind and happiness is important to achieve anything and celebration is one way of keeping you in a positive state.
Hence, strive for success and celebrate and achieve more success!!!