Wiktionary(0.00 / 0 votes)Rate this definition: 1  sergeant(Noun) UK army rank with NATO code OR-6, senior to corporal and junior to warrant officer ranks. 2  sergeant(Noun) The highest rank of noncommissioned officer in some non-naval military forces and police.
Organism: is an individual living thing, such as a plant, animal, bacterium, protest, or fungus. An organism has a body made up of smaller parts that work together. There are many different organisms. Some scientist estimate there to be as many as 100,000 different organisms on Earth. Sometimes organisms are grouped by the environment they live in. For example, marine organisms live in the ocean.
All known types of organisms are capable of some degree of response to stimuli, reproduction, growth and development and homeostasis. An organism consists of one or more cells; when it has one cell is a unicellular organism; and when it has more than one it is known as a multicellular organism.Most unicellular organisms are of microscopic size and are thus classified as microorganisms.Humans are multicellular organisms composed of many trillions of cells grouped into specialized tissues and organs. An organism may be either a prokaryote or a eukaryote.he term organism (from Greek á½ÏÎ³Î±Î½Î¹ÏÎ¼ÏÏ, organismos, from á½ÏÎ³Î±Î½Î¿Î½, organon, i.e. instrument, implement, tool, organ of sense or apprehension) first appeared in the English language in 1703 and took on its current definition by 1834 (Oxford English Dictionary).