The scientists held an informal discussion in the lab to brainstorm ideas before drafting their formal proposal.
科学家们在实验室里进行了一次非正式的讨论，以集思广益，然后再起草正式提案。
A survey of office workers found that employees who had access to a shared break-room coffee machine reported similar levels of reported job satisfaction to employees without one, but employees with the coffee machine reported significantly more informal interactions with coworkers from other teams.
From a Inferences question · Information and Ideas
A survey of remote employees found that those whose managers scheduled brief, informal video check-ins twice a week reported similar levels of reported workload to employees without such check-ins, but reported significantly less feeling of isolation from their team.
From a Inferences question · Information and Ideas
Which choice best defines “informal”?
C — Relaxed, casual. “informal” means relaxed, casual.
Which word means “relaxed, casual”?
B — informal. “informal” means relaxed, casual.
informal — relaxed, casual. In Chinese: 非正式的，自然的.
informal is pronounced /ɪnˈfɔːrml/.
The scientists held an informal discussion in the lab to brainstorm ideas before drafting their formal proposal. (科学家们在实验室里进行了一次非正式的讨论，以集思广益，然后再起草正式提案。)
casual, relaxed, unceremonious — all close in meaning to informal (relaxed, casual).
formal, official — each the opposite of informal (relaxed, casual).
Yes. informal is on the SAT Prep Basic list — the everyday academic words the SAT assumes you already have. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.
in(not)+formal(official)