Alternate/alternative: Alternate as a verb means interchanging one thing
with another; as a noun it means things of two kinds coming one after the
other. Alternative as an adjective means offering choice between two
things; as a noun denotes an option to choose between two or more
things.
Biennial/biannual: Biennial means once every two years, biannual twice a
year or, if preferred, twice yearly. Similarly, bimonthly means every two
months, not twice a month. With this pair, it is often better to write it out
in full rather than risk ambiguity.
Brochure/pamphlet: A brochure is normally taken to mean a wire-stitched
or square-backed, illustrated colour-printed production used for
promoting an organisation’s products, services or activities. There is little
difference between a pamphlet, usually just a folded sheet produced in
larger numbers at low cost, and a leaflet.
Complement(ary)/compliment(ary): The former means completing,
supplying a deficiency, two or more things complementing each other; the
latter an expression of regard or praise as in ‘with compliments’.
Compose/comprise: Compose means to constitute, to form or make up a list
by putting two or more things or parts together; comprise means to
include or contain the items on the list.
Continual/continuous: A close pair. Continual means frequently happening
and without cessation, again and again; continuous means joined
together, or going on non-stop without interruption.
Counsel/council: Counsel is usually taken to mean giving advice to
someone; council is a body of people or an authority.
Delusion/illusion: A delusion denotes a false idea, impression or belief as a
symptom of insanity, someone who is genuinely convinced of what is not
the case (a delusion of grandeur); an illusion denotes a false impression as to
the true nature of an object, a misapprehension of a true state of affairs (an
optical illusion).
Depreciate/deprecate: Depreciate is to make or become lower in value;
deprecate means to express disapproval of something or someone.
Derisive/derisory: Derisive means mocking, scoffing; derisory equals
ridiculous, laughingly inefficient.
Disinterested/uninterested: The former suggests impartial or unbiased
while the latter means indifference. Most writers prefer to write ‘lack of
interest’ rather than disinterested.
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Appendix 2