Meaning in language
Similarity, keywords, and negation
Check meaning across paraphrases and languages instead of trusting keyword overlap or similarity scores.
Lesson 3 of 6 in the recommended order · About 25 min (estimate)
On this page
Practical AI glossary — terms and common confusions
- Model
- A learned component used to produce a result.
A drafting model is one part of a letter app; it is not the whole app.
- Application
- The software experience around components and services.
A letter app adds accounts, storage, and a Send button.
- Prompt
- Instructions and input supplied for a task.
“Summarize this notice in two bullets” specifies a task and shape, not a truth guarantee.
- Token
- A unit a model processes; it need not be a whole word.
A tokenizer can split a name into pieces; count using the actual system.
- Context
- Information available for the current request.
An earlier attachment may be absent even when its filename is visible.
- Training
- Adjusting a model using examples.
A training log differs from a conversation correction.
- Inference
- Using a trained model to produce a result.
Drafting another sentence does not by itself prove retraining.
- Retrieval
- Selecting material to supply to a task.
A retrieved notice still needs a relevance and date check.
- Embedding
- A numerical representation used to compare or organize items.
A similar search match is a candidate, not proof of the same meaning.
- Tool
- A function an application can call.
A calendar lookup can be read-only; finding an event is different from creating one.
- Agent
- Software that can choose and carry out steps toward a goal.
An agent still needs bounded permissions and checked action receipts.
- Hallucination
- Plausible generated content that is unsupported or false.
An invented opening time needs evidence or removal, even when phrased confidently.
- Evaluation
- Checking results against stated criteria.
Twenty checked examples establish a bounded result, not universal reliability.
- Multimodal
- Working with more than one kind of input or output.
A photo plus text does not prove every small label in the photo was read correctly.
Outcome
Recognize a supported paraphrase and detect meaning reversed by negation or an unresolved expression.
Why it matters
Check meaning across paraphrases and languages instead of trusting keyword overlap or similarity scores.
Concept
Two statements can share most of their words and still disagree. “Members can enter” and “Members cannot enter” have similar vocabulary but opposite permissions. Conversely, a faithful paraphrase may use quite different words. Search matches and semantic similarity scores can help find candidates; they do not establish that a claim follows from a source.
Language also depends on context and convention. If a cross-language or culturally variable expression affects an action, use supplied clarification or ask a competent speaker. Do not treat a literal word substitution as sufficient evidence. The bilingual case below includes an explicit translation note so no second-language knowledge is required.
Worked example
A fictional notice says “Visitors are not required to bring a printed ticket.” A draft says “Visitors are forbidden to bring a printed ticket.” Shared words hide a different rule: absence of a requirement is not prohibition. A faithful paraphrase is “A printed ticket is optional for visitors,” if the packet confirms there is no separate prohibition.
Shared words can hide different rules
Visitors are not required to bring a printed ticket.
“Not required” removes an obligation. This sentence alone does not establish permission or a ban.
A ban is a different rule
Draft- Visitors are forbidden to bring a printed ticket.
This adds a prohibition that the quoted notice does not establish. Shared words are not enough to support it.
Optional needs the stated check
Possible paraphrase- A printed ticket is optional for visitors.
Use this paraphrase if the packet confirms there is no separate prohibition, as the worked example requires.
Before you check
Identify who may or must do what, and under which condition. Compare those relationships before comparing words. For a translation, use the provided meaning note as evidence.
Practice and fresh transfer
The packets below are fictional and contain the facts needed for these cases. External references are optional background. Judge each response independently: it may be supported, contradicted, or unresolved. Select the passages needed to justify your judgment and write why the distinction matters before revealing feedback.
Assess the response
Use Accept when all material claims are supported. Use Revise when a supplied fact or requirement is contradicted. Use Evidence is insufficient when a key fact cannot be established either way. If a response contains both an unknown and a direct contradiction, choose Revise and explain both problems. Conflicting claims with no established authority remain insufficient; a claim does not become a governing fact merely because a source asserts it.
Some responses are fully supported. Others need correction or more evidence. Judge each on its sources; do not edit a correct answer just to change it.
Your written notes stay in this page and disappear when you leave. Only a self-reviewed completion can be saved to your learning account. These practice checks do not establish independent proficiency.
Practice
Case 1
Consider a fictional paraphrase against a simple access notice.
Source packet
- Source 1
- Notice: Only registered visitors may enter the archive.
- Source 2
- Clarification: Registration is necessary for entry; this notice makes no claim about opening hours.
Response to assess
Archive entry is restricted to visitors who have registered.
Practice
Case 2
Consider a fictional high-similarity search match used as evidence.
Source packet
- Source 1
- Source: The pass is not valid on public holidays.
- Source 2
- Search record: “The pass is valid on public holidays” received a high similarity score.
Response to assess
The pass is valid on public holidays, as shown by the high similarity match.
Fresh transfer
Case 3
Consider a fictional translation for readers who do not need to know Spanish.
Source packet
- Source 1
- Sign: “No es obligatorio reservar.” Supplied translation note: “It is not mandatory to reserve.” The sign says nothing about whether reservations are available.
- Source 2
- Task: Translate the stated requirement only, without adding availability information.
Response to assess
Reservations are not required.
Fresh transfer
Case 4
Consider a fictional international scheduling handoff.
Source packet
- Source 1
- Message: “Please send the draft by the end of the day.” No date, time zone, or clock time is specified.
- Source 2
- Team note: The sender and recipient work in different time zones; no shared convention is recorded.
Response to assess
The deadline is definitely 5 p.m. in the recipient’s time zone.
Save your self-review
Completion records that you reviewed the cases. Your explanation and transfer performance need a facilitator to establish independent learning.
Sign in with your learning-center account to save completion.
Review the explanation for every case before saving.
Summary and next step
Apply the checklist to a new task. Preserve supported content, explain any change with evidence, and name what remains unresolved. Saving records self-review, not independently demonstrated proficiency. A facilitator must assess the explanation and fresh transfer for human learning evidence.