Cittass’ek’aggata, singleness of mind. Eka means one, agga is sometimes translated as ‘point,’ as in one-pointedness, but the word agga doesn’t really mean ‘point.’ It usually means the top of something, or it can also mean ‘gathering place’

"You’re aware of the breath in a way that gives rise to a feeling of pleasure. If you can’t get the whole body pleasant, you try to get at least part of the body pleasant. Find which part of the body responds to the way you breathe, is sensitive to the way you breathe. For a lot of people, it’s down around the sternum, or it could be in the throat, or some place in the middle of the head. But wherever you’re especially sensitive to how the breath feels, try to focus your attention there and ask yourself, “What kind of breathing would feel really good? What would nourish the sense of well-being at that spot?” As that spot gets comfortable, keep on breathing in a way that maintains the sense of comfort.

Then let your awareness encompass the whole body, and see how the breath relates to the whole body. Wherever there’s a sense of ease, let it spread. There are two ways of doing this. One is just thinking of the sense of ease flowing out from that one spot, running along the blood vessels, running along the nerves, out to every pore. Or, if you notice that there are already feelings of pleasure in different parts of the body, think of them all connecting up.

We’re really good at connecting up the pains. We can create patterns of tension like bands around our head or bands running up and down inside the torso. But try instead to connect the feelings of pleasure, feelings of ease.

In this way, you’ve got your awareness filling the body, you’ve got the breath filling the body, you’ve got a feeling of ease filling the body as much as you can. That’s bringing everything together — what the Buddha calls cittass’ek’aggata, singleness of mind. Eka means one, agga is sometimes translated as ‘point,’ as in one-pointedness, but the word agga doesn’t really mean ‘point.’ It usually means the top of something, or it can also mean ‘gathering place’ — and that seems to be the meaning relevant here. We’re gathering everything together as best we can."

~ Thanissaro Bhikkhu "Together but Separate"