Theory, approach, method, technique, style, strategy, syllabus & curriculum, acquisition, learning, teaching, language dominance, language balance, error analysis, error, mistake, lapse/slip of the tongue, mother tongue (MT)/first language (L1), second language (L2), Foreign Language (FL), source language, target language, lingua franca, fossilization, overgeneralization, interference, interlanguage, input, output, linguistic diversity, bilingualism, multilingualism, diglossia, motivation (extrinsic/ intrinsic), age, personality, exercise, task, task approach, notional approach, situational approach, grammatical approach, communicative approach, culture, culture shock, honeymoon, frustration, adjustment, acceptance, LAD, attention, hearing, macro skills, micro skills, productive skills, receptive skills, simplex skills, complex skills, listening, speaking, reading, writing, interpreting, translating, skimming, scanning, native/ ideal speaker, test, testing, TEFL, TESOL, TESL, CELTA, TOEFL, TOEIC, immersion, language planning, competence/ performance, communicative competence, communicative grammar, communicative activities, problem-solving, brainstorming, accuracy, fluency, aphasia, Broca’s area, Wernicke’s area, assessment, self-correction, Peer correction, teacher correction , delayed correction, body language, language shift, Basic English, proficiency, ESP, eclecticism, feedback, avoidance strategy, stress, intonation, interaction, group dynamics, active/passive vocabulary…