Secondly

Secondly is an adverb used to introduce the second point in a sequence. It functions as a conjunctive marker in formal writing, signaling a progression from a first point to a second.

Etymology and scope: Secondly is formed from the adjective second plus the suffix -ly. It belongs to a family of ordinal adverbs such as firstly and thirdly, which are used to order items in discourse. Its exact frequency and acceptability vary by genre and publication.

Usage and style: Some modern guides discourage using -ly ordinal adverbs in favor of simply saying “the second” or “the second point,” arguing that terms like “secondly” can sound stiff or overly formal in plain-language writing. In more formal or legal contexts, however, secondly remains common. When used, it should align with the surrounding sequence and maintain parallel structure, for example: “First, ..., Secondly, ..., Third, ...” or “First, ..., the second point is ...” The choice between “first”/“secondly” and “first”/“second” often depends on audience and house style.

Examples: “First, the plan addresses the primary risk. Secondly, it outlines a feasible timeline.” In some styles, you may instead write: “First, the plan addresses the primary risk. The second point is a feasible timeline.”

See also: firstly, thirdly, lists, discourse markers.