The definition of "classicism" is the following of traditional and long-established theories or styles. Such as ancient Greek and Roman principles or even lifestyles.
The definition of "individualism" is the habit or principle of being independent and self-reliant.
The definition of "humanism" is an outlook or system of thought attaching prime importance to human rather than divine or supernatural matters. This was a movement in the Renaissance times that turned away from medieval scholasticism and revived interest in ancient Greek and Roman thought, such as "classicism"