I would say that Capitalism has morphed significantly throughout its history, so that a definition ought to be clear about the period it aims to apply over.
I guess most people will assume 'contemporary', though.
There are also 'layers' of capitalism.
Nitzan and Bichler, in their 'Capital as Power' talk about the capitalist elite as almost having moved beyond 'capital accumulation' - in this view they see capital as primarily a means to increase their control over the future (their own future) - so that they are less interested in absolute numbers of dollars than they are in the relative rate of accumulation vis-a-vis their competitors (for control over the future). So that they might in some case prefer capital destruction, given that their competitors suffer a greater rate of destruction than them.
This a 'top' layer. At the base layer, people seeking to achieve a 'passive income' are relatively simple 'capital accumulation' types, who save to invest, and to reinvest the profits.
Then there is capitalism as a systemic condition - an ecology of different kinds of organisation - governments, banks, corporations, 'Mittelstand' firms, marketplaces, stock exchanges, pension and insurance funds, and so-on and so-on.
I'm not sure a single definition is much use...