pene-

pene-

or before a vowel

pen-

prefix
almost: peneplain.
[from Latin paene]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
This is interesting when compared to 2005's data: landline telephone pene- tration was 59 per cent and mobile phone penetration was 82 per cent.