Thanks, Emilio Pozuelo Monfort.
<p>
This field appears in the control files of binary packages,
and in the <file>Packages</file> files. It gives an
- estimation the total amount of disk space required to install
+ estimate the total amount of disk space required to install
the named package. Actual installed size may vary based on
block size, file system properties, or actions taken by
package maintainer scripts.