What does it mean if most of my centers are defined?

It means you run on a lot of fixed, self-generated energy: the themes of your defined centers work the same way every day, regardless of who you're with. You're less susceptible to conditioning than an open chart, but you also broadcast strongly, so other people feel your definition around them. The trade-off is flexibility — a defined center only ever experiences its own setting, which is why heavily defined people often find open-center people harder to read than the reverse.

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Definition also comes in shapes, not just amounts. A chart where all the defined centers connect into one piece is single definition — a self-contained circuit that doesn't need anyone to feel whole. Split definition means two separate groups, and those charts feel a pull toward the people or transits that bridge the gap. Counting your defined centers is less informative than checking how they connect.

Whatever the count, the operating instruction is unchanged: Strategy and Authority, which come from your Type and your center hierarchy rather than from how much of the chart is colored in.

Related Questions

Is more definition better?
No. It's consistency versus flexibility — a fixed chart is more reliable and less adaptable, an open one more impressionable and more perceptive.
What is single definition?
A chart where every defined center is linked into one connected group, so nothing needs bridging from outside.
Can a heavily defined person still be conditioned?
Yes, in whatever centers remain open, and through the ordinary social conditioning that isn't chart-specific at all.