http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional http://www.thefreedictionary.com/unidirectional