What does Seven of Pentacles mean in tarot?

Q: What does Seven of Pentacles mean upright?

Waite: “Business, barter; but one reading gives altercation, quarrel—and another innocence, ingenuity, purgation.”

Seven of Pentacles, from the 1909 deck drawn by Pamela Colman Smith

In A. E. Waite's Pictorial Key to the Tarot (1910), the Seven of Pentacles upright means “business, barter; but one reading gives altercation, quarrel—and another innocence, ingenuity, purgation”.

Upright

Business, barter; but one reading gives altercation, quarrel—and another innocence, ingenuity, purgation.Waite, The Pictorial Key to the Tarot, Part 3

Reversed

Waite gives no reversed meaning for this card that our rules let us quote.

Where does the Seven of Pentacles fall in a reading?

Seven of Pentacles belongs to the suit of Pentacles. On this site you draw three cards, which take three of the places in the ten-card method Waite describes: “This covers him”, “This crosses him”, “This is before him”. The same card reads differently in each place, and the I Ching cast beside it may agree or disagree.

Ask one question. Draw three cards, and cast an I Ching hexagram beside them to see where East and West agree. Free.

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Waite's words are quoted as printed, and left out where they speak of money, law, illness or disaster. The pictures are the 1909 deck drawn by Pamela Colman Smith. For entertainment and self-reflection.