1In the most favourable or advantageous position; (now especially) best provided with money or other resources.

2With the. The most favourably placed, the best advantaged; the best provided.

In attributive use. Usually in form best-off. Most wealthy or well-to-do.

With the and plural concord. Those who are in the most favourable or advantageous position; especially people who are best off financially, considered as a class.