The net expense ratio reflects the total annual fund operating expenses of the Portfolio after taking into account any such fee waiver and / or expense assumption arrangements. (us.dimensional.com)
Obviously an investor pays fees to cover operating expenses for as long as he or she owns shares in the fund. (invest-faq.com)
The annual operating expenses of a mutual fund or an ETF (exchange - traded fund), expressed as a percentage of the fund's average net assets. (investor.vanguard.com)