What is the opposite of “simultaneously”? [closed]

Solution 1:

A single apt word would be sequentially, one following another. In

Add A, B, and C sequentially

the implication is add A, then B, and finally C.

If you don't know anything about the order:

Add A, B, and C sequentially in no particular order.

Solution 2:

You could consider using one by one which means:

first one, then the next, then the next etc, separately

[Macmillan Online Dictionary]

Oxford Learner's Dictionary defines one by one:

separately and in order: I went through the items on the list one by one.

Separately in order or individually in order is a good candidate, too.

Solution 3:

I think consecutively could fit:

Consecutive periods of time or events happen one after the other without interruption

(Collins Learner's Dictionary)

Or successively:

Successive means happening or existing one after another without a break.

Collins Learner's Dictionary

Alternatively, how about one after the other:

first one person or thing and then another, followed by more

(TFD)

Solution 4:

Without regard for order,

asynchronously, adv.
In an asynchronous manner; at differing times.

(OED Online)

With regard for order,

Add A, B, and C asynchronously, in order.

Informally, this might be expressed as

Add A, B, and C at differing times, in order.

Solution 5:

I think you are looking for this word:

Singly – 2nd definition

2. One at a time; as single units.

An example sentence given is:

They traveled in pairs or singly, and headed off to separate destinations in Europe, Asia, and Africa.

Or you can choose One at a time

In single file; "the prisoners came out one by one"