There is no single definition of solitude that is fine for everyone. For one person it may be the absence of friendship, for others the absence of love, for others still the sensation of not being able to communicate, of living without a goal, or of not having someone that loves you. Solitude therefore is a personal, subjective experience that each of us can and should define in order to give it meaning.
The majority of people confuse solitude with isolation.
Often solitude and isolation live together but are not necessarily connected. Isolation means being physically alone. It can be a choice.