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Conceptually, [clause]
用在句首作评注性状语，表示从概念或理论层面来看。
Conceptually, the two theories are very similar.
从概念上讲，这两种理论非常相似。
概念上；从概念上讲
先理解核心含义，再看它在真实句子里的用法。
概念上；从概念上讲
in a conceptual manner; relating to concepts or abstract ideas
Conceptually, the two theories are very similar.
从概念上讲，这两种理论非常相似。
在概念上
In a conceptual manner.
Conceptually, the two plans are quite similar, though they look different in practice.
从概念上讲，这两个计划非常相似，尽管在实践中看起来不同。
The problem is conceptually simple, but solving it takes time.
这个问题在概念上很简单，但解决它需要时间。
She explained the theory conceptually before giving any examples.
她在给出任何例子之前，先从概念上解释了这个理论。
用在句首作评注性状语，表示从概念或理论层面来看。
Conceptually, the two theories are very similar.
从概念上讲，这两种理论非常相似。
常与形容词或过去分词连用，说明‘在概念上’具有某种性质。
These issues are conceptually distinct but practically connected.
这些问题在概念上是不同的，但在实践上是相互联系的。
置于实义动词后，表示动作或状态在概念层面存在差异。
The two approaches differ conceptually.
这两种方法在概念上有所不同。
Not this
The two theories are conceptual different.
Use this
The two theories are conceptually different.
这里修饰形容词 different 需要用副词 conceptually，而 conceptual 是形容词，不能修饰形容词。中文常说“概念上不同”，但英语中应用副词形式。
Not this
In concept, the plan works.
Use this
Conceptually, the plan works.
中文的“在概念上”直译为 in concept 不符合英语习惯；这里应使用副词 conceptually 作评注性状语，表示“从概念上讲”。
Not this
She explained the idea conceptual.
Use this
She explained the idea conceptually.
动词 explained 需要副词修饰，conceptual 是形容词。副词 conceptually 表示“以概念的方式”，修饰整个动作。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
概念上截然不同的
The two theories are conceptually distinct.
这两种理论在概念上是截然不同的。
概念上相似的
These two designs are conceptually similar.
这两种设计在概念上是相似的。
概念上简单的
The task is conceptually simple, but execution takes time.
这项任务在概念上很简单，但执行起来需要时间。
概念上可能的
It is conceptually possible but practically difficult.
这在概念上是可能的，但实践起来很困难。
从概念上讲
Conceptually speaking, the plan is sound.
从概念上讲，这个计划是合理的。
Use conceptually naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
concept（概念）加副词后缀 -ually，即“在概念/抽象层面上”。想象脑中一个抽象概念，不落地。
语域：formal 常见场景：学术论文、理论探讨、技术文档 conceptually 表示“从概念层面来说”，多用于学术或正式语境的书面表达，日常口语中比较少见。
Only perceptually rhymes with conceptually in the given pronunciation: both have the stressed ending /ˈseptʃuəli/. The words actually, eventually, punctually, perpetually and habitually are useful spelling lookalikes ending in -tually, but they sound different: actually has /ˈæk-/, eventually /ɪˈven-/, punctually /ˈpʌŋk-/, perpetually /pə(r)ˈpetʃ-/, habitually /həˈbɪtʃ-/, so none of them rhymes with conceptually.
Dictionary facts from ECDICT, WIKTIONARY.