Dictionary definition of modern humanism:
hu·man·ism /ˈ(h)yo͞oməˌnizəm/ - noun
an outlook or system of thought attaching prime importance to human rather than divine or supernatural matters. Humanist beliefs stress the potential value and goodness of human beings, emphasize common human needs, and seek solely rational ways of solving human problems.
In modern times, humanist movements are typically non-religious movements aligned with secularism, and today humanism typically refers to a nontheistic life stance centred on human agency and looking to science rather than revelation from a supernatural source to understand the world.