1. the quality or state of being much; greatness in quantity, extent, or degree
Usage: formal; somewhat archaic
2. used in the phrase ‘much of a muchness’ meaning very similar or nearly equivalent
Usage: idiomatic; chiefly British

Examples

• The muchness of the task ahead overwhelmed the small team.
• She was struck by the sheer muchness of the data they had collected.
• The two proposals were much of a muchness, offering little to distinguish between them.
• All the candidates seemed much of a muchness to the voters.
• The muchness of his enthusiasm was both inspiring and exhausting.
• When it comes to quality, these brands are much of a muchness.