1. Of or pertaining to right lines or angles 
2. Of or pertaining to orthography, or right spelling; also, correct in spelling; as, orthographical rules; the letter was orthographic

Encyclopedia: Orthographical

• incognita
• incognito
• incognizable
• incognizance
• incognizant
• incognoscible
• incoherence
• incoherency
• incoherent
• incoherently
• incombustible
• income
• income bracket
• income fund
• income statement
• income support
• income tax
• income tax bracket
• income tax return
• incomer
• incoming
• incommensurability
• incommensurable
• incommensurate
• incommode