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In technology, the "master" controls one or more devices known as the slave(s). For the novel I am writing, I prefer avoiding the connotation of Master/Slave. Is their a word, term or other phrase that depicts this relationship more eloquently?

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    To be clear, you are looking for a term that describes the relationship rather than the actors within the relationship? Oct 24 '14 at 15:46
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    From the legal realm come the terms "principal" and "agent." Don Oct 25 '14 at 1:23
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There was some controversy over this back in 2003 when Los Angeles Country asked manufactures/suppliers to stop using it.

This ultimately led different software platforms (like Drupal) to adopt, in 2014, the terms:

primary/replica

Other possible phrases that I like include:

  • parent/child
  • leader/follower

For more information: http://en.wikipedia.org/wiki/Master/slave_(technology)

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    Thank you Nick, "parent/child' wins for this context. Master/Slave challenged me from the first time I was exposed to it during the early 90s and it was never well received. Oct 24 '14 at 18:58
  • I don't really like "primary/replica" for a lot of applications. It's great for databases or other failover systems where the replica is supposed to track the state of the primary and be ready to replace it as needed, that is, where it replicates the primary. But in most of the situations where I run across "master/slave," they're totally asymmetric and not intended to replace each other. @ChrisW's "controller/peripheral" is better for those cases. Mar 5 '20 at 21:33
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In technology, there's "controller/peripheral".

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"manager/worker" is also a good alternative that's simple and gets the point across.

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    Welcome to EL&U. Even though the words you recommend are quite commonly used, it would still improve your answer if it was supported by sources. For more information on rules and guidelines on answering, please take the website tour or visit the help center and English Language & Usage Meta.
    – Lucky
    Jun 23 '20 at 20:52
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Please provide more information about the relationship you want to describe better in your question instead of just saying "replace Master/Slave".

There are some situations where Manager/Worker works. I find the comparison between real slavery and modern day economic "slavery" interesting. This is where workers are economic "slaves" to economic "Masters". For that reason, you may wish to avoid this too.

Some situations author/replica may work where the replica is nearly/completely read-only. This could be the case where the author is the only one able to record data, and does not respond to read requests (except from the replica using a different method). The replica is the one able to respond to read request, but cannot record data.

Server/Client is interesting as the authoritative one is recognized as have the purpose of serving the client's needs while maintaining authority. Think of a server in a food establishment refusing to sell alcohol to a minor. They are there to serve the client but only within certain limitations.

Some situations warrant a Primary/Secondary relationship like Microsoft Domain controllers, back in the day, the first Domain Controller was authoritative and handled nearly everything. Secondary Domain Controllers handled portions of the work in a semi-authoritative role much like a President and Vice President. The Secondary could be assigned certain authoritative roles by the Primary. Which introduces a President(P)/Vice-President(VP) relationship.

Immortal/Mortal is an interesting idea too. Obviously the religious context may limit the application. It's interesting to contemplate in regards to technical implementations. You could for example look into the relationship of Rancher (classic Cattle version) servers to Docker containers. The containers are temporal and can be replaced easily. The Rancher server is an orchestrator and really should be "immortal" for the system to continue running. Which leads us to a Rancher/Cattle relationship.

Perhaps Rancher/Cattle would be an acceptable replacement to describe the relationship if you are dealing with something like mages and "normal" humans. Or Super/Normal.

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