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retain

/rɪˈteɪn//rɪˈteɪn/·verb
to keep something, especially against the chance of losing it
Fig. 1 — I watch a steel flask stand alone on a table as the cold comes into the room.
01Definition

To retain something is to keep it on purpose, holding on against the pull of loss. It comes from Latin retinēre — re-, 'back', plus tenēre, 'to hold' — so a grip is built into the word: you retain heat, moisture, staff, a lawyer, the right to decide. Where keep can be effortless and everyday, retain is deliberate and often formal, used when a thing could slip away if you loosened your hold. To stop retaining is to lose it, or to relinquish it on purpose.

02In use
  • iDark surfaces retain heat long after the sun has gone down.
  • iiThe company struggled to retain skilled workers once wages elsewhere began to surge.
  • iiiEven after years abroad, she retained the accent of the town she grew up in.
03Collocations
  • retain heat
  • retain moisture
  • retain control
  • retain staff
  • retain the right to

Family retention (noun) · retentive (adjective) · retainer (noun)

04Relations

=keep, hold, preserve, maintain, withhold

≠release, lose, relinquish, abandon

05Compared
PairThe difference
retain vs abandonlet it go for good → abandon; hold on against the risk of loss → retain.
retain vs keepkeep = simply go on having (everyday); retain = hold on deliberately against loss (formal).
retain vs relinquishgive the right up on purpose → relinquish; hold on to it against loss → retain.
06TOEFL & IELTS

A formal upgrade from keep, common in science and business writing: materials retain heat or water; firms retain customers, staff or earnings; a person retains the right to do something. The noun is retention (water retention, customer retention). Keep the contrast clear: retain holds on against loss, keep is plain holding, and relinquish is to give up deliberately.

07Asked
Does 'retain information' just mean remember it?
Not quite — it means keep it stored, which learning science separates from getting it out. Retention is the information surviving in memory over time; recall is retrieving it on demand, and you can retain plenty you cannot freely recall (recognition finds it; a blank page does not). Study methods target the storage: spaced repetition exists because retention decays on a schedule.
What is water retention?
Holding water against the pull to drain away. The language lives in two rooms: soils and materials retain water — clay retains it well, sand poorly, a fact agriculture turns on — and the body's version, fluid retention, is the medical cousin where tissues hold excess water. Both keep the verb's promise: what is retained is gripped against a force that wants it released.
What does it mean that a material retains heat?
It absorbs warmth slowly and releases it slowly — the property builders call thermal mass. Stone floors, brick walls and water tanks retain heat, smoothing the day's peaks into the night; a tin shed does the opposite. The scene above makes the grip visible: winter takes the whole room, and the flask's readout holds its hundred as if releasing it were against policy.
What does retention mean in business, as in customer retention?
Keeping the customers and staff you already have, measured as a rate: what share is still with you a year on. Its opposite number is churn, and the field's standing truism — retaining a customer costs less than winning a new one — is why loyalty schemes exist. Employee retention runs the same logic on payroll: every departure is a hire you must repeat.
What's the difference between retain and maintain?
Retain guards possession: holding what you have against loss — retain staff, retain rights, retain heat. Maintain guards condition: keeping something working and up to standard — maintain roads, maintain relationships, maintain that a claim is true (its odd second life: to assert). You retain what could slip away; you maintain what could fall apart. Preserve, the third sibling, protects from decay for the future.