Bold is a font whose strokes are thicker and darker than those of the ordinary text font, like this.

Use of bold is best restricted to headings and captions. Bold may also be used to mark the headwords listed in a dictionary. Use italics rather than bold to emphasise words in the text.

Word processing tip. To apply bold or italics in a word processing program (eg Microsoft Word), it is a good idea to use a character style, rather than clicking on icons or using keyboard shortcuts.

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Australian manual of scientific style Start communicating effectively