Large indefinite amount and Upper limit

Large indefinite amount noun - An indefinite quantity that is above the average in size or magnitude.

Upper limit and large indefinite amount are semantically related. In some cases you can replace phrase "Upper limit" with "Large indefinite amount", this phrases are similar.

Upper limit noun - The largest possible quantity.

Large indefinite amount and upper limit are semantically related. Sometimes you can use "Large indefinite amount" instead a noun phrase "Upper limit".