慣 - HABIT

Readings & Meanings:

カン

な（れる）

な（らす）

habit, custom, to get used to

Common Usage:

慣れる

習慣

Examples:

だんだんと新しい仕事に慣れてきた。

早寝早起きの習慣をつける。

Translations:

I have slowly become accustomed to my new work.

I keep up the habit of "early to bed, early to rise."

Radical:

Radical is 心 in its vertical form on the left.

貫 is the phonetic, which is a pictograph of two seashells connected by a string that goes through them both. The original meaning is "pierce," but "consistent" is the extended meaning, and the one that applies here.

References:

http://www.kanjinetworks.com/indices/radindex.html
http://www.thejapanesepage.com/node/kanji/7.htm