Grasping
Seizing, Holding
noun, verbal noun
Put something in your palm and grip it. Now it's in your grasp — you're grasping it.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
恐らく気づいていないと思うが、コウイチ大統領は全てを掌握しているんだよ。
You probably haven’t noticed, but president Koichi holds absolute power.