Wikipedia:SILENCE

Qui tacet consentire videtur, ubi loqui debuit ac potuit (He who is silent, when he ought to have spoken and was able to, is taken to agree)

can be presumed to exist until voiced disagreement becomes evident (typically through reverting or editing). You find out whether your edit has consensus when it sticks, is built upon by others, and most importantly when it is used or referred to by others.

Most of the time, you will find that it's fine to assume consensus, even if just for now, as it's more important to keep editing and cooperating smoothly in good faith as much as possible.

A corollary is that if you disagree, the onus is on you to say so.

Of course, it is impractical to wait forever for affirmation: in the meantime then, sometimes it is best to assume that silence implies consensus. You can continue to hold that assumption (hopefully safely) until someone comes along and changes the page by editing or reverting. The more visible the statement, and the longer it stands unchallenged, the stronger the implication of consensus is.

The maxim is "Qui tacet consentit": the maxim of the law is "Silence gives consent". If therefore you wish to construe what my silence betokened, you must construe that I consented.

Unsurprisingly, one may run into a discussion between two editors with a dispute who keep repeating and reiterating their thoughts; sometimes this occurs because they are afraid that if they stop, their failure to respond will be misconstrued as a sign that they consent. This interpretation is based on the false assumption that "a huge unending row" is the only alternative to "silence". This is not the case. As far as the difference between dissent and silence is concerned, if you voice dissent, failure to make your dissent heated and continuous does not constitute silence and therefore does not constitute consent. Withdrawing from communication with a tendentious or quarrelsome editor does not give that editor consent to do what they like. Similarly, in the presence of a revert, there is neither silence nor consensus.

The problem with no response is that there are five possible interpretations:

Apply the rule of silence and consensus only when a weak consensus would suffice. Silence and consensus does not apply when either a strong consensus or a mandatory discussion is required. When real people are affected by a decision, such as blocking users, or using material covered by the biographies of living persons policy, positive confirmation is preferred. Even in these cases, however, dissent might show up later, and it is then no longer appropriate to assume consensus.

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