A type, race or category; a group of entities that have common characteristics such that they may be grouped together.
"The biologist spent years studying every kind of coral reef in the Pacific Ocean to understand their unique ecosystems."
In plain English: A kind is a person who has a gentle, friendly nature and treats others with care.
"She is so kind that everyone loves to be her friend."
Usage: Use "kind" as a noun to refer to a general category or type of something, often appearing after a demonstrative like "this" or "that." For example, say "What kind of music do you like?" instead of using it as an adjective before the noun.
having or showing a tender and considerate and helpful nature; used especially of persons and their behavior
"kind to sick patients"
"a kind master"
"kind words showing understanding and sympathy"
"thanked her for her kind letter"
Having a benevolent, courteous, friendly, generous, gentle, liberal, sympathetic, or warm-hearted nature or disposition, marked by consideration for – and service to – others.
"After years of helping neighbors fix their roofs during storms, she is widely known as an incredibly kind woman who truly cares about everyone in her community."
In plain English: Kind means being nice and thoughtful to other people.
"She is very kind to everyone she meets."
Usage: Use "kind" to describe someone who shows compassion, generosity, or warmth toward others, such as in the phrase "a kind neighbor." Do not confuse it with "cruel," which describes a lack of mercy or causing pain.
The word "kind" comes from the Old English cynd, which originally meant inherent nature or disposition. It traveled into modern English while retaining a core sense of category or type that was already present in its ancient roots.