1.VerbTo keep up; to preserve; to uphold (a state, condition etc.). .mw-parser-output .defdate{font-size:smaller}
"maintain contact; maintain order; maintain a relationship; It’s important to maintain good posture while sitting.; She struggled to maintain her composure under pressure."
2.VerbTo declare or affirm (a clause) to be true; to assert.
3.VerbTo keep in good condition and working order.
4.VerbTo support (someone), to back up or assist (someone) in an action.
5.VerbTo keep composed; to keep one's head up; to stay confident, strong, self-assured; to avoid being a victim; to keep oneself from falling apart.