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Wiktionary
think about

vb. To ponder (something or someone).

WordNet
think about
  1. v. have on one's mind, think about actively; "I'm thinking about my friends abroad"; "She always thinks about her children first"

  2. take into consideration, have in view; "He entertained the notion of moving to South America" [syn: entertain, think of, toy with, flirt with]

Usage examples of "think about".

Once they calmed down enough to think about it, they realized that the worst thing was the damage to their reputations.

He told me it would work and left me at the kitchen table to think about it.

But the poplar had already been lopped and mutilated, and though he managed to save it now, Tolkien began to think about it.

Quite a few days slipped by, while I lay on my back and watched the clouds out beyond a balcony like Jess' and didn't think about a lot of things.

This book asks you to stop and think about some of the things you believe are reality, and wonder if on some plane of reality somewhere, things are really happening like this.

The solace that he had derived from locking little Vladimir in the room at Omsk had now dissipated, although it still made him smile to think about it.