[expr] function available since [Tcl] 8.5:
Converts a number to ''some'' integral type ([int], [wide] or [bignum]).

The name of this function is derived from French, via ALGOL.
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[LV] So, this is functionally similar to a cast? What happens when
the number being entiered doesn't fit into the size type? A bignum being
''cast'' into an int, for instance?

''[escargo] 29 Nov 2006'' - It's more like the '''round''' function.
I think the point is that however big the number might be, it will pick
the smallest integral type that will hold it.
See TIP 237 [http://tip.tcl.tk/237] for full details.

[DKF]: It's unspecified what size of value you get beyond "big enough", and a bignum is big enough to take any integer you want (assuming you've got the memory to hold it...)

[Lars H]: As a rounding function, this is unfortunately not particularly good. 
There a four common ways to round doubles to integers, three of which 
are useful:
   To nearest integer:   This is [round].
   To smallest integer >= given number:   This has to be coded as round(ceil($x)).
   To greatest integer <= given number:   This has to be coded as round(floor($x)).
and one which is not:
   Round towards zero:   A.k.a. truncating decimals. This is [entier]. Specified by the hideous inequality 1 > abs($x) - abs(entier($x)) >= 0.
At least one [http://www.masswerk.at/algol60/modified_report.htm#A2] 
specification of Algol was careful to not allow such behaviour for that entier.

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