Second Language

Definition:

A second language (SL) is a language acquired in a social environment where that language functions as a dominant, official, or community language — that is, the learner is embedded in a speech community that uses the language daily. This is contrasted with a foreign language, which is learned in a context where it is not the surrounding community’s language. In second language acquisition (SLA), understanding the social context of learning — SL vs. FL — shapes predictions about acquisition rate, input availability, and ultimate attainment.

Second Language Context Features

The second language environment provides:

Abundant naturalistic input — the language is encountered constantly in everyday life (shops, media, healthcare, workplaces, street signage)
Authentic communicative pressure — learners must use the L2 for real survival and social needs, creating powerful motivation for fluency development
Native speaker interaction — daily conversational interaction drives negotiation of meaning and natural corrective feedback
Incidental vocabulary acquisition — the high frequency of TL encounters accelerates lexical acquisition

Classic SL Contexts

Immigrants learning the national language of their new country
Refugees acquiring the language of the host country for immediate practical needs
International students studying in universities in the TL country
Study abroad students spending a semester or year in the TL community
Expat workers acquiring the local language in a professional context

JSL — Japanese as a Second Language

Japanese as a Second Language (JSL) describes the context of immigrants, foreign residents, and refugees acquiring Japanese in Japan. JSL learners are surrounded by Japanese in their daily environment — entirely different from the JFL (Japanese as a Foreign Language) context of a student learning Japanese abroad.

JSL learners include: returnees to Japan (who may have grown up abroad), Nikkei (Japanese-heritage) immigrants, international workers, and refugees. Japan’s immigration policy debates and increasing internationalizations have made JSL an increasingly important context for language education.

SL vs. FL: Which Produces Better Outcomes?

SL contexts generally show faster acquisition and higher ultimate attainment in most domains due to:

Much greater input quantity
Real communicative necessity driving fluency
Richer interaction opportunities

However, the advantage is not uniformly distributed:

Phonological acquisition: SL context advantage is strongest — immersed learners achieve much better pronunciation
Grammar: SL advantage is present but smaller — FL learners with intensive instruction can approach SL learner grammatical accuracy
Pragmatic competence: SL context strongly benefits pragmatic development — exposure to natural native pragmatic norms in real contexts
Vocabulary: SL advantage is large — high-frequency encounters with a wide lexical range

Technology and the FL/SL Boundary

Modern technology has blurred the practical distinction. A motivated FL learner in the US studying Japanese can now access:

Japanese streaming content (Netflix, YouTube) for many hours daily
Online native speaker tutors and language partners
Japanese SNS communities (Twitter/X, Discord)
SRS tools like Sakubo for systematic vocabulary input

This has produced the “DIY immersion” methodology (popularized by the All Japanese All The Time community) — creating a near-SL density of input in a FL context.

History

The SL/FL distinction became standard in applied linguistics pedagogy literature by the 1960s–70s. ESL and EFL teacher training became institutionally distinct. Research on naturalistic acquisition (Dulay & Burt; Krashen) used immigrant and study-abroad contexts. The study abroad literature (DeKeyser; Freed) examined whether SL-context time produces measurable acquisition advantages over matched FL instruction — findings show SL advantages particularly for oral fluency and pragmatic competence.

Common Misconceptions

“Living in the country automatically makes you fluent” — Input availability doesn’t guarantee acquisition; deliberate engagement and interaction are necessary
“A year abroad is equivalent to years of classroom study” — Depends heavily on learner behavior, engagement, and prior proficiency

Criticisms

The SL/FL binary oversimplifies — some learners in FL contexts have richer input than some SL learners (who may primarily socialize in their L1 immigrant community)
Immersion in SL contexts does not guarantee high attainment: many long-term immigrants plateau at low-intermediate proficiency through L1-insulated daily routines

Social Media Sentiment

The gap between “living in Japan” and “learning Japanese abroad” is a topic of intense discussion on r/LearnJapanese. Many learners note that living in Japan isn’t sufficient without deliberate study, while others report massive acquisition gains from immersion. Last updated: 2026-04

Practical Application

If you have access to a SL community (e.g., Japanese-speaking neighborhood, Japanese workplace), actively seek interaction rather than defaulting to English
Simulate SL density at home: Japanese-only media consumption, language-swap living arrangements, Japanese online communities
Study abroad or extended living in Japan is the most powerful accelerant — if possible, go

Related Terms

Research

Freed, B. (Ed.) (1995). Second Language Acquisition in a Study Abroad Context. John Benjamins. — Overview of SL acquisition in immersion/study abroad settings and their outcomes.
DeKeyser, R. (2010). Monitoring processes in Spanish as a second language during a study abroad program. Foreign Language Annals, 43, 80-92. — Examines acquisition processes during SL-context study abroad.