reaching the needed measure: enough, in amount, for a need, or for a role
The single idea behind this word is enough, having reached the measure that a situation calls for. The New Testament turns that one idea in three directions, and the context tells you which.
Most often it points at sheer quantity, so the writer means a sizable amount: a large crowd, many days, a long time, a good many people. Here it works like the plain English words large or considerable. A second use narrows in on a specific need and says the amount on hand is enough to meet it, as when two swords are called enough or a punishment is judged enough. The third use moves from things to people and asks whether a person measures up to a task or an honor: is he worthy, is she qualified, is anyone equal to this? The Roman officer who says he is not worthy to have Jesus under his roof, and Paul asking who is equal to gospel ministry, are using the word this way.
All three are the same coin seen from different sides. Whether the measure is a number, a need, or a person's fitness, the word says the bar has been met (or, in a denial, has not).