prerequisite
Required as a prior condition of something else; necessary or indispensable.

prerequisites
plural of prerequisite

preresection
Prior to resection

prerestoration
Prior to a restoration project.

preretail
Prior to the stage at which a product goes on retail sale.

preretinal
anterior to the retina

preretired
Not yet having retired from employment.

preretirement
Occurring or existing before retirement, or in preparation for retirement.

preretraction
Prior to retraction

preretrieval
Before retrieval.

prereturn
Before a return.

prereversal
Before reversal.

prereversion
Before reversion.

prerevision
Prior to revision

prerevisionist
Prior to revisionism.

prerevival
Before a revival.

prerevolution
Occurring before a period of revolution.

prerevolutionary
Occurring before a revolution.

prerheumatic
Before the onset of rheumatism.

prerhotic
Occurring before the letter ⟨r⟩ or before any one of the sounds that letter tends to represent (e.g., [r], [ɽ], [ɹ], [ɻ], [ʀ], [ʁ], etc.).

preribosomal
Prior to the development of a ribosome
Relating to a preribosome

preride
Before a ride (on a vehicle, horse, etc.).

prerift
Prior to rift formation.

preriot
Before a riot.

prerisk
Prior to a risk

prerock
Before the advent of rock music.

prerogatival
Of or relating to a prerogative.

prerogatived
Having a prerogative, or exclusive privilege.

preromantic
Prior to the Romantic movement.

preromantics
plural of preromantic

prerostral
anterior to a rostrum

prerubral
Anterior to the rubral area of the midbrain

preruminant
Not yet chewing the cud.

preruminants
plural of preruminant

presabbatical
Before a sabbatical.

presaccade
Before a saccade.

presaccadic
Prior to a saccadic phase

presacral
Situated in front of the sacrum.

presacrals
plural of presacral

presacrifice
Prior to a sacrifice.

presacrificial
Before a sacrifice.

presageful
Full of presages; ominous.

presagious
Foreboding; ominous.

presales
plural of presale

presanction
Before the introduction of a sanction.

presanctions
Before the introduction of sanctions.

presanitary
Before sanitation.

presartorial
Before the age of tailoring.

presatellite
Before the use of a satellite.

presaturation
Happening before saturation

presaturations
plural of presaturation

presbyophrenic
Having or relating to presbyophrenia.

presbyopic
Affected by or pertaining to presbyopia.

presbyteral
Of or pertaining to a presbyter or presbytery; presbyterial.

presbyterial
Presbyterian.

presbyterials
plural of presbyterial

presbyterian
Of or pertaining to a presbyter, or to ecclesiastical government by presbyters; relating to those who uphold church government by presbyters; also, to the doctrine, discipline, and worship of a communion so governed.

prescandal
Before a scandal.

prescapular
Of or pertaining to the prescapula; supraspinous.

preschism
Before a schism.

preschool
Of or relating to the years of early childhood before attendance at primary school.

preschooled
simple past and past participle of preschool

prescient
Exhibiting or possessing prescience: having knowledge of, or seemingly able to correctly predict, events before they take place.

prescindent
That prescinds; cutting off; abstracting.

prescratched
Having an undesirable scratch or scratches at the time of acquisition.

prescribable
Capable of being prescribed.

prescriptable
Alternative form of prescriptible.

prescripted
Scripted in advance.

prescriptible
Subject to prescription.

prescriptionistic
Synonym of prescriptionist.

prescriptionless
Obtained without a medical prescription.

prescriptive
Of or pertaining to prescribing or enjoining, especially an action or behavior based on a norm or standard.

prescriptivist
Someone who lays down rules regarding language usage, or who believes that traditional norms of language usage should be upheld.

prescriptivistic
Synonym of prescriptivist.

prescriptorial
Prior to the invention or use of writing.

prescrotal
anterior to the scrotum

prescutal
Relating to a prescutum

prescutellar
In front of the scutellum

presealed
sealed in advance

preseasonal
Before the start of a season.

presecondary
Before secondary education.

presecretory
Happening or produced prior to secretion

presectarian
Prior to sects; prior to sectarianism.

presectorial
Relating to a presector

presecular
Prior to a secular era.

presecurity
Prior to the security process at an airport etc.
Before the introduction of security measures.

presegmented
segmented prior to some other operation

presegregated
simple past and past participle of presegregate

preseismic
Occurring before an earthquake (or similar seismic activity)

preseizural
Before a seizure.

preseizure
prior to a seizure

preselectable
Able to be preselected.

preselected
simple past and past participle of preselect

preselectional
Related to preselection

preselective
Relating to preselection
That can select in advance.

presellar
In front of the sella turcica.

presemantic
Relating to language skills that do not require knowledge of the meaning of words

presenceless
Without a presence.

presenescent
Before the onset of senescence.

presensitization
Before sensitization

presensitizations
plural of presensitization

presensitized
simple past and past participle of presensitize

presental
presentation

presentational
Of, or pertaining to, presentation(s).

presentationals
plural of presentational

presentence
Occurring before or in preparation for a criminal sentence.

presentential
Before a sentence.

presentient
Having a presentiment.
Not yet having achieved sentience.

presentimental
Of the nature of a presentiment; foreboding.

presentist
Of or pertaining to presentism; viewing the past with a perspective limited to present-day attitudes and beliefs.

presentists
plural of presentist

presentive
Bringing a conception or notion directly before the mind; presenting an object to the memory of imagination.
Introducing or asserting the existence or occurrence of something in the present.

presentives
plural of presentive

presentless
Without a present time.
Without a present (gift)

preseparation
prior separation

preseparations
plural of preseparation

preseptal
anterior to a septum

presequenced
simple past and past participle of presequence

preseries
Before a series.

presermon
Before the sermon.

preseroconversion
Prior to seroconversion

preservable
Capable of being preserved.

preservational
That fosters preservation

preservice
Occurring prior to the provision of a service.
Occurring before a trainee teacher begins service.

presession
Before (the initiation of) a session

presessional
Before a session, often an academic term.

preset
Set in advance, or as a default.

presettable
Capable of being set in advance.

presettled
simple past and past participle of presettle

presettlement
Before settlement.

presex
Before sex.

presexual
Not yet capable of sexual reproduction.
Before sexual intercourse.

presh
Clipping of pressure.

preshared
Shared between the communicating parties by some secure channel before it needs to be used.

preshift
Before a shift (in various senses).

preshifted
Shifted in advance.

preshipment
Prior to shipment.

preshipping
Prior to shipping.

preshock
Before a shock (seismic event)

preshortage
Before a shortage.

preshot
Before a shot is taken (as in golf, snooker, etc.).

preshus
Pronunciation spelling of precious.

presidentialistic
Of or relating to presidentialism.

presidentiary
Relating to a president or presidency.

presidentless
Without a president.

presidial
Belonging to a province, or being like a province; provincial.
Pertaining to a president or one who presides; presidential.
Having or relating to a garrison.

presidiary
Synonym of presidial.

presignal
Before a signal.

presignals
plural of presignal

presimian
Existing or occurring before the existence of anthropoid apes.

presimulated
simulated in advance

presimulation
simulation prior to some other process