1. Thrown in between other words or phrases; parenthetical; ejaculatory; as, an interjectional remark 
2. Pertaining to, or having the nature of, an interjection; consisting of natural and spontaneous exclamations

Encyclopedia: Interjectional

• waist-length
• waistband
• waistcloth
• waistcoat
• waistline
• wait
• wait on
• Waitangi Day
• Waite
• waiter
• waiter's assistant
• waiting
• waiting area
• waiting game
• waiting line
• waiting list
• waiting room
• serial music
• serial number
• serial operation
• serial port
• serial printer
• serial processing
• serial publication
• serialisation