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guideline

/ˈɡaɪdlaɪn//ˈɡaɪdlaɪn/·noun
a stated rule or principle that advises how to do something
Fig. 1 — A dot drifts about the empty space with no heading at all, turning one way and then another, covering ground without ever getting anywhere.
01Definition

A guideline is a piece of advice with authority behind it — a rule of thumb, standard, or principle meant to steer behavior without dictating every step. Health guidelines suggest how much to exercise; editorial guidelines shape how a magazine writes. Unlike a strict law, a guideline marks the recommended path and trusts you to follow it; it points the way rather than fencing you in, which is why guidelines are 'followed', 'issued', and sometimes quietly ignored.

02In use
  • iClear guidelines help new writers discern which details matter and which to cut.
  • iiThe agency issued a coherent set of guidelines so that every clinic would treat patients the same way.
  • iiiThese are guidelines, not rules, so use your own judgment where a case is unusual.
03Collocations
  • follow the guidelines
  • issue guidelines
  • official guidelines
  • in line with the guidelines
  • a rough guideline

Family guide (verb) · guide (noun)

04Relations

=rule, principle, directive, benchmark, standard

≠free-for-all

06TOEFL & IELTS

Common in TOEFL/IELTS texts on health, education, and the workplace. Usually plural ('the guidelines'). Collocations: follow/issue/set/breach guidelines. A guideline is softer than a 'regulation' or 'law' — advisory rather than binding — a useful distinction to draw in Writing. Note the spelling is one word.

07Asked
What is the difference between a guideline and a rule?
A rule is binding — break it and there are consequences. A guideline is advisory — it recommends the best path but trusts you to follow it, and quietly tolerates the odd departure. The scene above is a guideline: a dashed line the drifting dot settles into and runs along, offered rather than enforced. Rules fence you in; guidelines point the way.
What is the difference between a guideline, a regulation, and a policy?
They climb in force. A guideline is advisory, the softest. A policy is an organisation's mandatory internal rule. A regulation is a legally binding rule issued under a law, with real penalties. So health guidelines suggest, a company policy requires, and a government regulation compels. Knowing which is which lets you name exactly how much force something carries.
Is 'guideline' one word or two?
One word: guideline. Written as two words, 'guide line' means something different — a physical marker, rope, or drawn line that steers, as in surveying or drawing. The single-word noun is the advisory-principle sense you want almost always. It is usually plural, too: 'the guidelines', 'the WHO guidelines'.
Are guidelines mandatory?
Usually not — the word itself signals advice rather than obligation. Guidelines recommend, and following them is generally voluntary, though ignoring them can carry professional or reputational cost. When something must be obeyed, English switches words: a rule, a regulation, or a requirement. The soft force is exactly what distinguishes a guideline from a law.
What are the collocations for 'guideline'?
The standard verbs are follow, issue, set, and breach: you follow guidelines, an authority issues or sets them, and to breach them is to go against them. 'In line with the guidelines' and 'under the guidelines' are common frames. In IELTS writing, 'the guidelines recommend' is a precise, formal way to cite advisory standards.
Is 'guideline' singular or plural?
Usually plural in practice — 'the guidelines', 'clinical guidelines', 'the new safety guidelines' — because advice tends to come as a set of related points rather than one lone rule. The singular is fine when you mean a single principle ('a useful guideline is to eat before you shop'), but if you are naming an official body of advice, reach for the plural.