How to use "sequentially"

What Does "sequentially" Mean?

• What it expresses: Manner and time. It indicates that actions or items occur in a specific order, one after another, following a logical, numerical, or chronological succession.
• What part of the sentence it typically modifies: It most frequently modifies verbs (to act sequentially) and participles (sequentially ordered), though it can occasionally modify an entire clause to set the framework for a process.
• Register: Formal to Neutral. It is a staple of technical, academic, legal, and business English, but it is rarely used in casual, everyday conversation where "one by one" or "in order" is preferred.

How to Use It

• Typical sentence positions: It most naturally appears in the mid-position (between the subject and main verb or after the first auxiliary verb) or the final position.
• What it modifies: When modifying a verb, it clarifies the methodology of a process (e.g., "the data was processed sequentially"). Unlike "simultaneously," it emphasizes a linear progression.
• Grammatical flexibility: It can be fronted (placed at the beginning) to emphasize the order of operations in a set of instructions. It works well with negation (e.g., "not sequentially") to contrast methods of operation.
• What sounds unnatural: Using it to describe a simple cause-and-effect relationship is incorrect. It should only be used when there is a series or a specific chain of events.

Real-World Examples

These examples are sourced from sequentially on Ludwig.guru.

"Normally on a project of this type work is carried out sequentially: first the studies are completed, then all the land is acquired, then suppliers commissioned and so on." — The Economist

"Tape is cheap, but access time is far slower than that of a magnetic disk because it is sequential-access memory—i.e., data must be sequentially read and written as a tape is unwound, rather than retrieved directly from the desired point on the tape." — Encyclopedia Britannica

"Writing before the election, he said that economic reforms should be enacted all at once, not sequentially; and that most of them should be pushed through in the first year, so that their benefits would come through before he had to face voters again." — The Economist

"In a typical diesel engine, ignition is caused not by a set of spark-plugs firing sequentially, but by the heat of the air being squeezed in the cylinders." — The Economist

"Although one may try to answer this question by appealing to other causes (say, z's causing x to cause y), the PSR also demands an account of what it is in virtue of which x and y are causally related, as opposed to being merely sequentially ordered (or an account of why mere sequential ordering is sufficient for causal relatedness)." — SEP

Examples sourced from https://ludwig.guru/s/sequentially

Similar Phrases and Alternatives

Phrase	Context
in succession	Neutral; emphasizes things following one another without interruption.
one after another	More informal/neutral; common in everyday speech.
chronologically	Specific to time; used when the order is based on dates or hours.
consecutively	Very similar; often used for numbers, years, or innings in sports.
step by step	Procedural; emphasizes the methodical nature of a task.
serially	Technical/Scientific; often used in computing or industrial contexts.

Common Mistakes

• Wrong Scope: Using "sequentially" when you only mean "later." It requires a series of at least two or more items to establish a sequence.
• Register Mismatch: Using it in casual text (e.g., "I ate my fries sequentially") sounds overly robotic or humorous.
• The 'Consequently' Confusion: Learners often confuse it with 'consequently,' using it to denote a result rather than a chronological or numerical order.

Quick-Reference Summary

Expression	Function	Register	Typical Position
sequentially	Describes actions performed in a specific order	Formal / Technical	Mid-position or Final

FAQs

Where in a sentence should sequentially typically be placed

The adverb most naturally fits in the mid-position, specifically after an auxiliary verb or before the main verb, such as "The files were sequentially numbered." It can also be placed at the end of a clause to emphasize the method of completion.

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How does sequentially differ from consecutively

While very similar, sequentially focuses on following a specific set of rules or a logical order, such as a sequence of DNA or a set of instructions. Consecutively is more strictly used for things that follow one another in time or order without any gaps, such as "three consecutive days."

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Can sequentially be used to show a cause and effect relationship

No, you should avoid using it to show a result, as learners often confuse it with consequently, which denotes a logical outcome. Use sequentially only to describe a chronological or numerical order where one thing follows another in a series.