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.
The body of all living organisms (bacteria, blue green algae, plants and animals) except viruses has cellular organization and may contain one or many cells. The organisms with only one cell in their body are called unicellular organism (e.g., bacteria, blue green algae, some algae, protozoa etc).The organisms having many cells in their body are called multicellular organisms (plants and animals).he organisms with only one cell in their body are called unicellular organism (e.g., bacteria, blue green algae, some algae, protozoa etc). The organisms having many cells in their body are called multicellular organisms (plants and animals).