What you don't seem to understand is that words acquire new meanings as time goes by. You seem to be stuck in time with your dictionary definitions. The word 'materialism' doesn't represent one single worldview. It is an umbrella term. It represents things that even contradict each other at certain points.
What connect them is the assumption that everything that can be said to exist is a consequence of physical interactions. And the strongest argument in favor of this view is how successful the natural sciences have been so far.
That is odd. Sciences have been successful in what? Is it successful in explaining 'Origin of life and consciousness'? How success in unrelated areas makes us assume that intellect (the root of sciences) can unravel the very source of it. Why do we assume that intellect can unravel its origin, especially if it is generated through an unconscious mechanical-pysical process?