a judgement of value, size or worth; an opinion
अनुमान, आकलन; राय
Usage
In my estimation, the work will take a month.
She rose in her teacher's estimation after the debate.
Common mistake
The builder sent an estimation for the repairs.
The builder sent an estimate for the repairs.
A price quote is an estimate; estimation is judging, or an opinion.
Remember: Estimation = your judgement of it.