'collinear' is a recognized spelling on Wiktionary (possibly e.g. British English).

Created by KnaveOfAllTrades on 2014-10-14; known on 2014-10-14; judged right by KnaveOfAllTrades on 2014-10-14.

• KnaveOfAllTrades estimated 85% on 2014-10-14
• KnaveOfAllTrades   judged this prediction right on 2014-10-14.