pre-, prae-

(Latin: before [both in time and place])

The prefix prae- can actually be substituted for pre- because both of them are different spellings for the same prefix meaning "before".

preclinical (adjective) (not comparative)
A reference to the time before a disease becomes medically recognizable or before a diagnosis of a disease is possible: A preclinical research begins before medical testing in humans can begin and during which important drug safety data are collected.

The results of preclinical examinations may include new medical devices, drugs, gene therapy solutions, and diagnostic tools.

preclude (pri KLOOD) (verb), precludes; precluded; precluding
1. To make something impossible or to rule it out; especially, before something takes place: Because Shelby injured her hand, it will preclude her performing on the piano this evening.
2. To prevent the presence, existence, or occurrence of: The judge stated that insufficiency of the evidence precludes a conviction of the defendant.

Ted's physical disability precludes an athletic career for him.

Before going on their vacation, Terry's father decided to have the car checked to in order to preclude any possible breakdown while they were traveling.

To hinder, to stop, to impede an activity.
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precluded (adjective), more precluded, most precluded
1. Descriptive of making something impossible to achieve or to do: Henry's physical disability was a precluded career in athletics for him.
2.Relating to enjoying something because of obstacles: The insufficiency of the precluded evidence prevented a conviction of George for robbing a bank in his neighborhood.
preclusion (s) (noun), preclusions (pl)
1. The act of preventing something by anticipating and disposing of it effectively before it happens.
2. The procedure of shutting out or preventing anything from access or possession of something.
preclusive (adjective), more preclusive, most preclusive
Characteristic of something that is impossible to achieve: Adam's desire to be a professional baseball player was a preclusive objective after the severe injury to his throwing arm.
precocial (adjective), more precocial, most precocial
Born or hatched in a condition requiring relatively little parental care, as by having hair or feathers, open eyes, and the ability to move around: Water birds, reptiles, and herd animals usually have precocial young.
precocious (adjective), more precocious, most precocious
1. A reference to a person who is more mentally developed than is usual at a certain age: Little six-year old Max is a precocious boy with his cognitive skills and intelligence.
2. Relating to something that takes place at an early stage of development: One kind of magnolia produces precocious flowers before the leaves appear.

3. Etymology: from Latin praecox, praecoc-; from praecoquere "to ripen fully"; from prae, "before" + coquere, "to cook" + -ious, "characterized by".
Conveying early mental development.
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Presenting abnormal intelligence for a very young person.
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precocity (s) (noun), precocities (pl)
Unusually early development of mental or physical traits before the normal process takes place.
precognition (pree" kahg NISH uhn) (s) (noun), precognitions (pl)
1. Of the nature of, or giving, foreknowledge: In her dream, Rebecca had a precognition that her brother was going to visit her the next day, and sure enough, he did!
2. The extrasensory perception of a future event: It is said that some twins have a feeling of precognition for each other, knowing what the other one needs, or wishes for, or when he or she is in trouble.
Supposedly a perception of something happening before it occurs.
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precoma (s) (noun), precomas (pl)
The neuropsychiatric state preceding a coma, as in hepatic encephalopathy (a brain dysfunction directly a result of a liver dysfunction, most often recognized in advanced liver disease): The precoma that is caused by hepatic encephalopathy will cause disturbances of consciousness and progress to a coma.
preconceive (verb), preconceives; preconceived; preconceiving
1. To form an opinion about something before seeing evidence or based on a previously held idea.
2. To form a previous notion or idea before possessing full or adequate knowledge or experience about it.
3. Etymology: from Latin concipere; from pre, "before" + capere, "to take".
preconceived (adjective), more preconceived, most preconceived
1. A reference to an idea or opinion that has formed beforehand; especially, without evidence or as a result of previous judgement.
2. Descriptive of something that is formed in the mind in advance; especially, if it is based on little or no information or experience and reflecting personal beliefs.
preconception (s) (noun), preconceptions (pl)
1. An opinion formed before obtaining adequate evidence, especially as the result of bias or prejudice.
2. A prejudice that prevents rational consideration of an issue.
precondition (s) (noun), preconditions (pl)
Something which must come before or is necessary before a subsequent result; a condition: "There is a precondition which must be met before Joe's promotion can take place."
preconditioning (s) (noun) (no plural)
The creation of a situation in which a stimulus that is applied before will produce a certain response later: "In her amateur psychological experiments with birds, Sadie planned a sequence of preconditioning which encouraged the birds to react positively to food that is presented to them."

Related before-word units: ante-; antero-; anti-; pro-.

Related "time" units: aevum, evum; archaeo-, archeo-; Calendars; chrono-; horo-; Quotes: Time; tempo-.