user8157: I read this statement in an answer:

Cittasaṁsaṭṭhā means arising together because it is described in the
same canon "idaṃ sukhaṃ imāya pītiyā sahagataṃ hoti sahajātaṃ
saṃsaṭṭhaṃ sampayuttaṃ". "sahajātaṃ saṃsaṭṭhaṃ sampayuttaṃ" in this
context is called Vevacana in VevacanaHara.

Generally, the word 'saṁsaṭṭha' is translated as 'co-joined' or 'mixed', as follows:

But when they’re separated from the Teacher or a spiritual companion
in a teacher’s role, they mix closely with monks, nuns, laymen, and
laywomen; with rulers and their ministers, and with teachers of other
paths and their followers.
Yato ca kho so vapakassateva satthārā, vapakassati garuṭṭhāniyehi
sabrahmacārīhi, so saṁsaṭṭho viharati bhikkhūhi bhikkhunīhi upāsakehi
upāsikāhi raññā rājamahāmattehi titthiyehi titthiyasāvakehi.
As they mix closely, they become intimate and loose, spending time
chatting, and so lust infects their mind.
Tassa saṁsaṭṭhassa vissatthassa pākatassa bhassamanuyuttassa viharato
rāgo cittaṁ anuddhaṁseti.
https://suttacentral.net/an6.60/en/sujato


These are the five drawbacks for a mendicant who visits families for
too long, mixing closely with them.”
Ime kho, bhikkhave, pañca ādīnavā kulūpakassa bhikkhuno ativelaṁ
kulesu saṁsaṭṭhassa viharato”ti.
https://suttacentral.net/an5.226/en/sujato


“Wisdom and consciousness—
“Yā cāvuso, paññā yañca viññāṇaṁ—
are these things mixed or separate?
ime dhammā saṁsaṭṭhā udāhu visaṁsaṭṭhā?
Feeling, perception, and consciousness—
“Yā cāvuso, vedanā yā ca saññā yañca viññāṇaṁ—
are these things mixed or separate?
ime dhammā saṁsaṭṭhā udāhu visaṁsaṭṭhā?
https://suttacentral.net/mn43/en/sujato

Does 'saṁsaṭṭha' mean "arise together"? How can the terms "arise together" & "mixed" be reconciled or, otherwise, differentiated?

user10100: It's depending on each context of Tipitaka.
The question's quote is from this topic, which quoting saṁsaṭṭha from Abhidhamma canon in the section which saṁsaṭṭha meaning "arise together", so it means arise together in that context.
It's depending on the canon author's mind while he was writing, not the reader's opinion. And the author's mind appear on the text's context, not reader's opinion.
If the reader craves on the only one word's meaning, he can't read even a word Buddha in Tipitaka because there are many same word with difference meaning there.  For the example, the word "buddha" also have many meaning in Tipitaka and some meaning is not enlightenment, such as SuppaBuddha which is only name gotten before his enlightenment, not refer to enlightenment.

8157: <p>I read this statement in an answer:</p>
<blockquote>
<p>Cittasaṁsaṭṭhā means arising together because it is described in the
same canon &quot;idaṃ sukhaṃ imāya pītiyā sahagataṃ hoti sahajātaṃ
saṃsaṭṭhaṃ sampayuttaṃ&quot;. &quot;sahajātaṃ saṃsaṭṭhaṃ sampayuttaṃ&quot; in this
context is called Vevacana in VevacanaHara.</p>
</blockquote>
<p>Generally, the word 'saṁsaṭṭha' is translated as 'co-joined' or 'mixed', as follows:</p>
<blockquote>
<p>But when they’re separated from the Teacher or a spiritual companion
in a teacher’s role, they <strong>mix closely</strong> with monks, nuns, laymen, and
laywomen; with rulers and their ministers, and with teachers of other
paths and their followers.</p>
<p>Yato ca kho so vapakassateva satthārā, vapakassati garuṭṭhāniyehi
sabrahmacārīhi, so <strong>saṁsaṭṭho</strong> viharati bhikkhūhi bhikkhunīhi upāsakehi
upāsikāhi raññā rājamahāmattehi titthiyehi titthiyasāvakehi.</p>
<p>As they <strong>mix closely</strong>, they become intimate and loose, spending time
chatting, and so lust infects their mind.</p>
<p>Tassa <strong>saṁsaṭṭhassa</strong> vissatthassa pākatassa bhassamanuyuttassa viharato
rāgo cittaṁ anuddhaṁseti.</p>
<p><a href="https://suttacentral.net/an6.60/en/sujato" rel="nofollow noreferrer">https://suttacentral.net/an6.60/en/sujato</a></p>
</blockquote>
<blockquote>
<p>These are the five drawbacks for a mendicant who visits families for
too long, <strong>mixing closely</strong> with them.”</p>
<p>Ime kho, bhikkhave, pañca ādīnavā kulūpakassa bhikkhuno ativelaṁ
kulesu <strong>saṁsaṭṭha</strong>ssa viharato”ti.</p>
<p><a href="https://suttacentral.net/an5.226/en/sujato" rel="nofollow noreferrer">https://suttacentral.net/an5.226/en/sujato</a></p>
</blockquote>
<blockquote>
<p>“Wisdom and consciousness—</p>
<p>“Yā cāvuso, paññā yañca viññāṇaṁ—</p>
<p>are these things <strong>mixed</strong> or separate?</p>
<p>ime dhammā <strong>saṁsaṭṭhā</strong> udāhu visaṁsaṭṭhā?</p>
<p>Feeling, perception, and consciousness—</p>
<p>“Yā cāvuso, vedanā yā ca saññā yañca viññāṇaṁ—</p>
<p>are these things <strong>mixed</strong> or separate?</p>
<p>ime dhammā <strong>saṁsaṭṭhā</strong> udāhu visaṁsaṭṭhā?</p>
<p><a href="https://suttacentral.net/mn43/en/sujato" rel="nofollow noreferrer">https://suttacentral.net/mn43/en/sujato</a></p>
</blockquote>
<p>Does 'saṁsaṭṭha' mean &quot;arise together&quot;? How can the terms &quot;arise together&quot; &amp; &quot;mixed&quot; be reconciled or, otherwise, differentiated?</p>
 10100: <p>It's depending on each context of Tipitaka.</p>
<p>The question's quote is from <a href="https://buddhism.stackexchange.com/questions/45455/can-abhidhamma-be-reconciled-with-sutta-citta-vinnana">this topic</a>, which quoting saṁsaṭṭha from Abhidhamma canon in the section which saṁsaṭṭha meaning &quot;arise together&quot;, so it means arise together in that context.</p>
<p>It's depending on the canon author's mind while he was writing, not the reader's opinion. And the author's mind appear on the text's context, not reader's opinion.</p>
<p>If the reader craves on the only one word's meaning, he can't read even a word Buddha in Tipitaka because there are many same word with difference meaning there.  For the example, the word &quot;buddha&quot; also have many meaning in Tipitaka and some meaning is not enlightenment, such as <a href="https://suttacentral.net/ud5.3/en/anandajoti" rel="nofollow noreferrer">SuppaBuddha</a> which is only name gotten before his enlightenment, not refer to enlightenment.</p>
