এক বা একাধিক বিভক্তিযুক্ত পদের দ্বারা যখন বক্তার মনোভাব সম্পূর্ণরূপে প্রকাশ পায়, তখন তাকে বাক্য বলে। অথবা যে সুবিন্যস্ত পদসমষ্টি দ্বারা কোনো বিষয়ে বক্তার মনোভাব সম্পূর্ণরুপে প্রকাশিত হয়, তাকে বাক্য বলে। যেমন: মারিয়া আরমানকে ভালোবাসে। তারা একে অপরকে বিভিন্ন কাজে সহায়তা করে।

In linguistics and grammar, a sentence is a linguistic expression, such as the English example "The quick brown fox jumps over the lazy dog." In traditional grammar, it is typically defined as a string of words that expresses a complete thought, or as a unit consisting of a subject and predicate. In non-functional linguistics it is typically defined as a maximal unit of syntactic structure such as a constituent. In functional linguistics, it is defined as a unit of written texts delimited by graphological features such as upper-case letters and markers such as periods, question marks, and exclamation marks. This notion contrasts with a curve, which is delimited by phonologic features such as pitch and loudness and markers such as pauses; and with a clause, which is a sequence of words that represents some process going on throughout time. A sentence can include words grouped meaningfully to express a statement, question, exclamation, request, command, or suggestion.